Dr. Ajay Soni

Dr. Ajay Soni
Office Address:-,
Dr. Ajay Soni, PhD, SM-IEEE,
School of Physical Sciences,
Indian Institute of Technology Mandi,
Academic Block A4, Office # 306, Kamand Campus - 175075
Himachal Pradesh, India
Email: ajay[at]iitmandi[dot]ac[dot]in
Phone: +91-1905-267854

Research Interests

  • Experimental Condensed Matter Physics
  • Light matter interaction in quantum materials
  • Quantum Transport and Nano-functional Devices
  • Thermoelectric and Optoelectronic Materials
  • Charge Transport in Layered 2D Materials
  • Phonon optimized engineered materials
    • Researcher ID: E-1488-2011
  • Personal HomePage
  • Google: Scholar

  • Professional Experience

    • Associate Professor, Indian Institute of Technology Mandi, Mandi (HP), (2019 onwards )
    • Assistant Professor, Indian Institute of Technology Mandi, Mandi (HP), (2013-2019)
    • Visiting Professor, Rensselaer Polytechnic Institute Troy, NY USA, May-July 2018
    • Post-Doctoral Fellow, National University of Singapore, Singapore, 2011-2013
    • Post-Doctoral Fellow, Nanyang Technological University, Singapore, 2009-2011
    • Lecturer (Physics) Govt. College, Nimbahera, Chittorgarh, India, 2003-2004
    • Lecturer (Physics) Govt. College, Mandphia, Chittorgarh, India, 2002-2003

    Education

    • Ph. D. (Physics) UGC-DAE Consortium for Scientific Research, Indore (MP), 2004-2009.
      Thesis title: “Study of Physical Properties of Nanomaterials”,
    • M. Sc. Physics, M. L. S. University, Udaipur, (Raj.), India, 1999-2001
    • B. Sc., M. L. S. University, Udaipur, (Raj.), India, 1996-1999

    Achievements

    • UGC-CSIR National Eligibility Test, India (June 2002)
    • Position in M. L. S. University merit for M.Sc. (Physics) 2001

    Institute Services at IIT Mandi

    • Chair, Newsletter Committee of School of Physical Sciences (2022 onwards)
    • Co-coordinator, 14th Foundation day of IIT mandi (2023)
    • Chair, Institute Space Allocation Committee (2019-2022)
    • Member of Library Advisory Committee (2021-2022)
    • Chair, Newsletter Committee of School of Basic Sciences (2020-2022)
    • Faculty Advisor of M.Sc. and I-PhD in Physics 2019 Batch.
    • Program Coordinator for M.Sc. and I-PhD in Physics (2018-2021)
    • Member of Board of Academics, IIT Mandi (2018-2021)
    • Member of Board of SRIC (2019-2021)
    • Chair, Committee for Selection of research staff SRIC (2017-2021)
    • Chair, Committee for planning and funrnishing of A9 building: Innovations center and Admin units.
    • Chair, Committee for planning and utilization of the Auditorium comlpex area in north campus.
    • Coordinator for Teaching Physics Laboratories UG, PG and I-PhD (Physics) (2016-2020)
    • Chair, Committee for Academic Purchases(2018-2019)
    • Member of Day Care Committee, IIT Mandi (2014-2016)
    • Member of Stundent Gymkhana Election Committee, IIT Mandi (2015-2016)
    • Assistant Warden, Dashir and Beas Kund Hostel in Mandi (2013-2015)

    Teaching

    • August-November 2013 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2014 : PH-501 Solid State Physics, for B.Tech/MS/PhD students
    • February-June 2014 : IC-201P Engineering Design Practicum, for B.Tech students (Group 7 and 14)
    • August-November 2014 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2015 : PH-601 Mesoscopic Physics and Quantum Transport, for PhD students
    • February-June 2015 : IC-201P Engineering Design Practicum, for B.Tech students (Group 6 and 15)
    • August-December 2015 : PH-415P Electronics Laboratory Practicum, for I-PhD (Physics) students
    • February-June 2016 : PH-523 Condensed Matter Physics, for I-PhD (Physics) students
    • August-November 2016 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2017 : PH-601 Mesoscopic Physics and Quantum Transport, for PhD students
    • August-December2017 : PH-513 Quantum Mechanics, for B. Tech, M. Sc. and i-PhD (Physics) students
    • February-June 2018 : (Coordinator) PH-526 Research Project III for I-PhD (Physics) students
    • February-June 2018 : (Coordinator) PH-622 Mini Thesis- II for I-PhD (Physics) students
    • February-June 2018 : IC-201P Engineering Design Practicum, for B.Tech students (Group 12)
    • August-December 2018 : PH-513 Quantum Mechanics, for B. Tech, M. Sc. and i-PhD (Physics) students
    • August-December 2018 : PH-601 Mesoscopic Physics and Quantum Transport, for MSc, i-PhD and PhD (Physics) students
    • February-June 2019 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2019 : IC-201P Engineering Design Practicum, for B.Tech students (Group 7)
    • August-December 2019: PH-601 Mesoscopic Physics and Quantum Transport, for MSc, i-PhD and PhD (Physics) students
    • February-June 2020 : IC-222P Physics Practicum, for B. Tech students
    • August-December 2021: PH-601 Mesoscopic Physics and Quantum Transport, for MSc, i-PhD and PhD (Physics) students
    • August-December 2021: PH 518P and PH-615P Coordinating PGP-1 and Mini Thesis-1, for MSc and i-PhD (Physics) students
    • February-June 2022 : PH 523 Condensed Matter Physics, for MSc and i-PhD (Physics) students
    • February-June 2022 : PH 519P and PH-622 Coordinating PGP-2 and Mini Thesis-2, for MSc and i-PhD (Physics) students
    • February-June 2022 : PH-415P Electronics Laboratory Practicum, for MSc/I-PhD (Physics) students
    • August-December 2022: PH-301 Quantum Mechanics and Applications, for B Tech students
    • January-June 2023: PH-501 Solid State Physics, for B Tech students
    • January-June 2023 : PH 611P Experimental Research Techniques, for MSc and i-PhD (Physics) students
    • August-December 2023: PH-301 Quantum Mechanics and Applications, for B Tech students
    • January-June 2024: PH-501 Solid State Physics, for B Tech students

    Group Members

    • Post-Doctoral Fellow:
    • (1) Dr. Manoj Kumar
    • Doctoral Students:
    • (1) Kewal (2019-24)
    • (2) Divya (2019-24)
    • (3) Ankit (2020-25)
    • (4) Shilpa (2022-2027)
    • (5) Aditya Singh(2020-26): I-PhD Physics Batch 2020
    • (6) Aksa (2020-26): I-PhD Physics Batch 2020
    • (7) Prithwija (2024-2028)
    • Masters Students:
    • (1) Shivani Chaubey (2023-24): M Tech BioTechnology Batch 2022,
    • (2) Memansa (MSc in Physics) from NIT Hamirpur
    • (3) Bhavya (2024-25): MSc in Physics
    • (4) Divya(2024-25): MSc in Physics
    • Alumni Doctoral Students:
    • (1) Dr. Mahesh (2014-18) : Process Interace Engineer, Nexperia, Newport, UK
    • (2) Dr. Somnath (2013-18) : Post Doctoral Fellow at Yonsei Univserity, South Korea
    • (3) Dr. Juhi (2014-20) : Post Doctoral Fellow at KAIST, South Korea
    • (4) Dr. Niraj (2016-21) : Post Doctoral Fellow at University of Linkoping, Sweden
    • Alumni Masters Students:
    • (1) Ankit (2017-19): M. Sc. Chemistry Batch 2017 : PhD Scholar at IIT Mandi
    • (2) Aditya Prasun (2018-20): M. Sc. Chemistry Batch 2018
    • (3) Pooja (2018-20): M. Sc. Physics Batch 2018
    • (4) Shumile (2018-20): M. Sc. Physics Batch 2018 : JRF at INST Mohali
    • (5) Aakash (2018-20): M. Sc. Physics Batch 2018
    • (6) Yogesh (2018-20): M. Sc. Physics Batch 2018
    • (7) Shivani(2019-21): M. Sc. Chemistry Batch 2019
    • (8) Nikita (2019-21): M. Sc. Chemistry Batch 2019
    • (9) Kashik(2019-21): M. Sc. Physics Batch 2019
    • (10) Sumit(2019-21): M. Sc. Physics Batch 2019
    • (11) Rajendra(2019-21): M. Sc. Physics Batch 2019
    • (12) Riya Nager (2020-22): M Tech BioTechnology Batch 2020,
    • (13) Abhishek Sahu(2020-22): M. Sc. Chemistry Batch 2020,
    • (14) Sandhya(2020-22): M. Sc. Physics Batch 2020,
    • (15) Shreeshyam (2020-22): M. Sc. Physics Batch 2020,
    • (16) Liza (2020-22): M. Sc. Physics Batch 2020,
    • (17) Akshi(2022-23): Integrated BS-MS in Physics, Intern from NIT Patna,
    • (18) Shraddha (MSc in Energy Sciences) from Amrita University Coimbatore
    • (19) Memansa (MSc in Physics) from NIT Hamirpur
    • International Students:
    • (1) Cleir Mathew, Masters in Physics, University of Liverpool, United Kingdom (Summer Intern, June-July 2016).
    • (2) Shoeb Athar: Masters in Chemistry, University of Reading, United Kingdom (March-Spetember 2019)
    • Intern Students
    • (1) Vishal, Summer Intern from IIT Jodhpur (June-July 2019).
    • (2) Navmi, Summer Intern from MG University, Cochin, Kerala (June-July 2019).
    • (3) Mehak, Summer Intern from Delhi University, Delhi (June-July 2019).
    • (4) Priya, Summer Intern from Sri sai University, Palampur, Himachal pradesh (June-July 2017).
    • (5) Anjali, Summer Intern from Sant Longowal Institute of Engineering and Technology, Punjab (June-July 2017).
    • (6) Mani Mohan, Summer Intern from IISER, Bhopal, (June-July 2015 and 2016).
    • (7) Savin, PhD student at Univeristy of New Mexico, United States (Aug 2015-March 2016).
    • (8) Nitika, M.Tech. Intern students from University of Rajasthan, Jaipur, (August 2014-January 2015).
    • (9) Urmila, M. Sc., Summer Intern from IIT Gandhinagar (June-July 2022).
    • For internships: Institute invites applications for internship. Keep an eye on the timely advertisements.
    • Students interested to work in the exciting field of Experimental Condesnsed Matter Physics, Nanoscience & Nanotechnology are welcome to join Indian Institute of Technology Mandi For ADMISSIONS

    Research Facilities

    • Facility for bulk materials synthesis by melt grown method,
    • Facility for solution growth for metallic nanomaterials and semiconducting quantum dots,
    • Temperature dependent Seebeck coefficient and Resistivity Measurements Set-up (80-600 K): Suported by DAE:BRNS-YSRA 2015-18,
    • Central Research Facility at IIT Mandi Research Facility

    Projects and Awards

    • Indo-Sweden Joint Network Grant in Collaboration with Prof P. Eklund, Linkoping University, Sweden, supported by Department of Sceince and Technology (DST), India and Swedish Research Council , Sweden; Total Grant: INR 38,40,000
    • DRDO-CARS Proposal, DLJ, Jodhpur, Rajasthan, India (2020-2021); Total Grant: INR 15,24,000
    • DST-SERB Core Research Grant (EMR-Individual Centric), by Science and Engineering Research Board (SERB), Delhi, India; Total Grant: INR 47,12,400.
    • Bhaskara Advanced Solar Energy (BASE) Research Fellowship 2018 by Indo-US Science and Technology Forum and Department of Science and Technology India. Visiting Rensselaer Polytechnic Institute, Troy.
    • DAE Young Scientist Research Award by Board of Research in Nuclear Sciences, India; Total Grant: INR 25,00,000.
    • DST-SERB Young Scientist Start Up Grant, by Science and Engineering Research Board (SERB), Delhi, India; Total Grant: INR 26,06,000.
    • Institute seed grant for new faculty by IIT Mandi; Total Grant: INR 17,70,000.

Professional Activity

Books and Chapters

Publications

  1. Symmetry breaking and structure instability in ultra-thin 2H-TaS2 across charge density wave transition,
    Divya Rawat, Aksa thomas, Ajay Partap Singh Rana, Chandan Bera and Ajay Soni,
    Phys Rev B 109, 155411 (2024).
  2. Ultralow lattice thermal conductivity in complex structure Cu26V2Sn6Se32 due to interaction of low-frequency acoustic-optical phonons,
    Kewal Singh Rana, Debattam Sarkar, Nidhi Pandey, Aditya Singh, Chandan Bera, Kanishka Biswas and Ajay Soni,
    Phys Rev B 109, 115202 (2024),
  3. Chemically Transformed Ag2Te Nanowires on Polyvinylidene Fluoride Membrane For Flexible Thermoelectric Applications,
    Ankit Kashyap, Divya Rawat, Debattam Sarkar, Niraj Kumar Singh, Kanishka Biswas and Ajay Soni,
    Angewandte Chemie International Edition, 202401234 (2024).
  4. Nanomolecularly-Induced Effects at Titania/Organo-Diphosphonate Interfaces for Stable Hybrid Multilayers with Emergent Properties,
    Collin Rowe, Ankit Kashyap, Geetu Sharma, Naveen Goyal, J. G. Alauzun, Sean T. Barry, N. Ravishankar, Ajay Soni, Per Eklund, Henrik Pedersen, Ganpati Ramanath,
    Accepted in ACS Applied Nano materials (2024) ,
  5. Tuning the magnetic properties in MPS3 (M = Mn, Fe, and Ni) by proximity-induced Dzyaloshinskii Moriya interactions,
    Suvodeep Paul, Devesh Negi, Saswata Talukdar, Saheb Karak, Shalini Badola, Bommareddy Poojitha, Manasi Mandal, Sourav Marik, R. P. Singh, Nashra Pistawala, Luminita Harnagea, Aksa Thomas, Ajay Soni, Subhro Bhattacharjee, Surajit Saha,
    Phys Rev B 109, 085136 (2024),
  6. Multiphonon interactions and collective excitations in charge density wave of transition metal dichalcogenides,
    Divya Rawat, Juhi Pandey and Ajay Soni,
    Arxiv (2024).
  7. Lattice Instability induced Concerted Structural Distortion in Charged and van der Waals Layered GdTe3,
    Prabir Dutta, Sushmita Chandra, Ivy Maria, Koyendrila Debnath, Divya Rawat, Ajay Soni, Umesh V. Waghmare and Kanishka Biswas,
    Advanced Functional Materials 2312663 (2023).
  8. Interaction of Acoustic and Optical Phonons in Soft Bonded Cu-Se Framework of Large Unit Cell Minerals with Anionic Disorders,
    Kewal Singh Rana, Raveena Gupta, Debattam Sarkar, Niraj Kumar Singh, Somnath Acharya, Satish Vitta, Chandan Bera, Kanishka Biswas and Ajay Soni,
    Phys Rev B 108, 045202 (2023),
  9. Anisotropic Light-Matter Interactions in Single Crystal Topological Insulator Bismuth Selenide,
    Divya Rawat, Aditya Singh, Niraj Kumar Singh and Ajay Soni,
    Phys Rev B 197, 155203 (2023),
  10. Extended Antibonding States and Phonon Localization Induce Ultralow Thermal Conductivity in Low Dimensional Metal Halide,
    Paribesh Acharyya, Koushik Pal, Abdul Ahad, Debattam Sarkar, Kewal Singh Rana, Moinak Dutta, Ajay Soni, Umesh V. Waghmare and Kanishka Biswas,
    Advanced Functional Materials 2304607 (2023).
  11. Thermoelectricity in Ag/Cu Based Complex Crystal Structure Minerals with Inherent Low Thermal Conductivity,
    Kewal Singh Rana and Ajay Soni,
    Invited Review Article in Oxford Open Materials Science 3(1), itad005 (2023),
  12. Glassy Thermal Conductivity in Cs3Bi2I6Cl3 Single Crystal,
    Paribesh Acharyya, Tanmoy Ghosh, Koushik Pal, Kewal Singh Rana, Moinak Dutta, Diptikanta Swain, Martin Etter, Ajay Soni, Umesh V. Waghmare, and Kanishka Biswas,
    Nature Communications 13, 5053 (2022). Among the Top 25 Nature Communications Physics Articles of 2022.
  13. Electron-Phonon Coupling and Quantum Correction to Topological Magnetoconductivity in Bi2GeTe4,
    Niraj K. Singh, Divya Rawat, Dibyendu Dey, A. Elsukova, Per O. A. Persson, Per Eklund, A. Taraphder and Ajay Soni,
    Phys Rev B 105, 045134 (2022), arXiv:2110.06587
  14. Strong Anharmonicity-Induced Low Thermal conductivity and High n-type Mobility in Topological Insulator Bi1.1Sb0.9Te2S,
    Riddhimoy Pathak, Prabir Dutta, Ashutosh Srivastava, Divya Rawat, Radha K. Gopal, Abhishek K. Singh, Ajay Soni and Kanishka Biswas,
    Angewandte Chemie, 61, e202210783 (2022).
  15. Intrinsically Low Thermal Conductivity in n-type Vacancy-Ordered Double Perovskite Cs2SnI6: Octahedral Rotation and Anharmonic Rattling,
    Animesh Bhui, Tanmoy Ghosh, Kaushik Pal, Kewal Singh Rana, Kaushik Kundu, Ajay Soni and Kanishka Biswas,
    Chemistry of Materials 34, 7, 3301:3310 (2022).
  16. Local Symmetry Breaking Suppresses the Thermal Conductivity in Crystalline Solid,
    Moinak Dutta, M. V. D. Prasad, Juhi Pandey, Ajay Soni, Umesh V. Waghmare and Kanishka Biswas,
    Angewandte Chemie, 61, e202200071 (2022).
  17. Low-Temperature Microwave Processed TiO2 as an Electron Transport Layer for Enhanced Performance and Atmospheric Stability in Planar Perovskite Solar Cells,
    Sudhir Ranjan, Rahul Ranjan, Ankit Tyagi, Kewal Singh Rana, Ajay Soni, Hari Krishna Kodali, Vikram Dalal, Anand Singh, Ashish Garg, Kanwar Nalwa and Raju K Gupta
    ACS Applied Energy Materials 5, 3, 2679:2696 (2022),
  18. Ultralow Thermal Conductivity and Thermoelectric Properties of Bi4GeTe7 with an Intrinsic van der Waal Heterostructure,
    Niraj Singh, Ankit Kashyap and Ajay Soni,
    Applied Physics Letters, 119, 223903 (2021),
  19. Ultralow Thermal Conductivity in Earth-Abundant Cu1.6Bi4.8S8: Anharmonic Rattling of Interstitial Cu,
    Animesh Bhui, Moinak Dutta, Madhubanti Mukherjee, Kewal Singh Rana, Abhishek K. Singh, Ajay Soni and Kanishka Biswas,
    Chemistry of Materials 33, 8, 2993 (2021).
  20. Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe2,
    Subhajit Roychowdhury, Tanmoy Ghosh, Raagya Arora, Manisha Samanta, Lin Xie, Niraj Kumar Singh, Ajay Soni, Jiaqing He, U.V. Waghmare and K. Biswas,
    Science 371, 722-727(2021).
  21. Local Ferroelectric Polarization in Antiferroelectric Chalcogenide Perovskite BaZrS3 Thin Film,
    Juhi Pandey, Debjit Ghoshal, Dibyendu Dey, Tushar Gupta, A. Taraphder, Nikhil Koratkar and Ajay Soni,
    Phys Rev B 102, 205308(2020) , arXiv:2004.13678
  22. Crystalline Anharmonicity and Ultralow Thermal Conductivity in Layered Bi2GeTe4 for Thermoelectric Applications, Niraj Singh and Ajay Soni,
    Applied Physics Letters 117, 123901 (2020),
  23. Intrinsically Ultralow Thermal Conductivity in Ruddlesden-Popper 2D Perovskite Cs2PbI2Cl2: Localized Anharmonic Vibrations and Dynamic Octahedral Distortions,
    Paribesh Acharyya, Tanmoy Ghosh, Koushik Pal, Kaushik Kundu, Kewal Singh Rana, Juhi Pandey, Ajay Soni, U.V. Waghmare and K. Biswas,
    The Journal of the American Chemical Society 142 (36), 15595(2020). Highly cited JACS article during 2020-21.
  24. Electron-Phonon Interactions and Two Phonon Modes Associated with Charge Density Wave in Single Crystalline 1T-VSe2, Juhi Pandey and Ajay Soni,
    Physical Review Research, 02, 033118 (2020) , arXiv:1912.05802 (2020) ,
  25. NrGO Floating Gate/SiOXNY Tunneling Layer Stack for Nonvolatile Flash Memory Applications,
    Mahesh Soni, Ajay Soni, S. K. Sharma
    IEEE Transactions on Device and Materials Reliability 20 (3), 570 (2020).
  26. Spectroscopic Correlation of Chalcogen Defects in Atomically Thin MoS2(1-x) Se2x Alloys,
    Rahul Sharma, Juhi Pandey, Krishna Sahoo, Kewal Singh Rana, Ravi kumar Biroju, Wolfgang Theis, Ajay Soni, T. N. Narayanan,
    Journal of Physics: Materials, 3, 045001 (2020) ,
  27. An Environmentally Stable and Lead-Free Chalcogenide Perovskite,
    Tushar Gupta, Debjit Ghoshal, Anthony Yoshimura, Swastik Basu, Philippe K. Chow, Aniruddha S. Lakhnot, Juhi Pandey, Jeffrey M. Warrender, Harry Efstathiadis, Ajay Soni, Eric Osei-Agyemang, Ganesh Balasubramanian, Shengbai Zhang, Su-Fei Shi, Toh-Ming Lu, Vincent Meunier and Nikhil Koratkar,
    Advanced Functional Materials 30 (23) 2001387, (2020) ,
  28. Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Cu Deficient Superionic Thermoelectric Cu2-xTe,
    Juhi Pandey, Shriparna Mukherjee, Divya Rawat, Shoeb Athar, Kewal S. Rana, Ramesh C. Mallik and Ajay Soni,
    ACS Applied Energy Materials 3, 3, 2175(2020).
  29. Excitation Density Dependent Photoluminescence Studies on Homo-Epitaxial GaN Nanowall Networks Grown by Laser Assisted Molecular Beam Epitaxy,
    C. Ramesh, Juhi Pandey, P. Tyagi, Ajay Soni, M. Senthil Kumar, S. S. Kushvaha,
    Journal of Nanoscience and Nanotechnology 20 (6), 3866 (2020).
  30. Ultralow Thermal Conductivity in Chain Like TlSe due to Inherent Tl+ Rattling,
    Moinak Dutta, Shidaling Matteppanavar, Matukumilli V. D. Prasad, Juhi Pandey, Avinash Warankar, Pankaj Mandal, Ajay Soni, U.V. Waghmare and K. Biswas,
    Journal of the American Chemical Society 141, 51, 20293 (2019).
  31. Unraveling Biexciton and Excitonic Excited States from Defect Bound States in Monolayer MoS2,
    Juhi Pandey and Ajay Soni,
    Applied Surface Science 463, 52 (2019) ,
  32. Engineering ferroelectric instability to achieve ultralow thermal conductivity and high thermoelectric performance in Sn1-xGexTe,
    A. Banik, T. Ghosh, R. Arora, M. Dutta, J. Pandey, S. Acharya, Ajay Soni, U.V. Waghmare and K. Biswas,
    Energy and Environmental Science, 12, 589 (2019).
  33. Selective Oxidation of WS2 Defect Domain with Sub-Monolayer Thickness Leads to Multifold Enhancement in Photoluminescence. P. Kumar, J. Biswas, J. Pandey, K. Thakar, Ajay Soni, S. Lodha, V. Balakrishnan
    Advanced Materials Interfaces, 6(20), 1900962 (2019).
  34. Melt spinning: A rapid and cost effective approach over ball milling for the production of nanostructured p-type Si80Ge20 with enhanced thermoelectric properties, Riya Thomas, Ashok Rao, Nagendra S. Chauhan, Avinash Vishwakarma, Niraj Kumar Singh and Ajay Soni
    Journal of Alloys and Compounds 781, 344 (2019),
  35. Enhancement of Power Factor for Inherently Poor Thermal Conductor Ag8GeSe6 by Replacing Ge with Sn,
    Somnath Acharya, Juhi Pandey and Ajay Soni
    ACS Applied Energy Materials 2(1), 654 (2019) ,
  36. Rare Earth Doping and Effective Band-Convergence in SnTe for Improved Thermoelectric Performance,
    Somnath Acharya, Dibyendu Dey, Tulika Maitra, Ajay Soni and Arghya Taraphder
    Applied Physics Letters 113, 193904 (2018) , arXiv:1811.04389
  37. Effect of ion-implantation-induced defects and Mg dopants on thermoelectric properties of ScN,
    Nina Tureson, Marc Marteau, Thierry Cabioch, Ngo Van Nong, Jens Jensen, Jun Lu, Daniele Fournier, Niraj Singh, Ajay Soni , Laurent Belliard, Per Eklund, Arnaud le Febvrier
    Physics Review B 98, 205307(2018) , arXiv:1809.09027
  38. Interface properties probed by active THz surface emission in Graphene/SiO2/Si heterostructures,
    Zehan Yao, Lipeng Zhu, Yuanyuan Huang, Longhui Zhang, Wanyi Du, Zhen Lei, Ajay Soni and Xin Long Xu
    ACS Applied Materials and Interfaces 10 (41), 35599 (2018).
  39. Coupling of Charge Carriers with Magnetic Entropy for Power Factor Enhancement in Mn Doped Sn1.03Te for Thermoelectric Applications,
    Somnath Acharya, Sharmistha Anwar, Takao Mori and Ajay Soni
    Journal of Materials Chemistry C 6, 6489 (2018).
  40. Integration of Graphene Oxide Buffer Layer/Graphene Floating Gate for Wide Memory Window in Pt/Ti/Al2O3/GO/graphene/SiO2/p-Si/Au Non-Volatile (FLASH) Applications,
    Mahesh Soni, Ajay Soni, S. K. Sharma
    Applied Physics Letters 112, 252102 (2018).
  41. Charge Carriers Modulation and Thermoelectric Performance of Intrinsically p-Type Bi2Te3 by Ge Doping,
    Niraj Singh, Juhi Pandey, Somnath Acharya and Ajay Soni,
    Journal of Alloys and Compounds 746, 350 (2018) ,
  42. Scalable and site specific functionalization of reduced graphene oxide for circuit elements and flexible electronics,
    Mahesh Soni, Pawan Kumar, Juhi Pandey, Satinder K. Sharma and Ajay Soni,
    Carbon 128, 172 (2018) ,
  43. Nitrogen doped multilayer photo catalytically reduced graphene oxide floating gate: Al/PMMA/NrGO/SiO2/p–Si/Au based hybrid gate stack for non volatile memory applications,
    Mahesh Soni, Ajay Soni, S. K. Sharma
    Organic Electronics 51, 48-53, (2017) ,
  44. Reduction of the thermal conductivity of the thermoelectric material ScN by Nb alloying,
    Nina Tureson, Ngo Van Nong, Daniele Fournier, Niraj Singh, Somnath Acharya, Susann Schmidt, Laurent Belliard, Ajay Soni, Arnaud le Febvrier, and Per Eklund,
    Journal of Applied Physics 122, 025116 (2017) ,
  45. Enhanced thermoelectric properties of Yb doped SnTe,
    Somnath Acharya and Ajay Soni
    AIP Conference Proceedings 1832, 110028 (2017).
  46. Photo-catalytic reduction of oxygenated graphene dispersions for supercapacitor applications,
    Mahesh Soni, Pawan Kumar, Rudra Kumar, S. K. Sharma Ajay Soni,
    Journal of Physics D: Applied Physics 50, 124003, (2017) ,
  47. Selective Detection of F— Using Al Microarrays Integrated Graphene Oxide,
    Mahesh Soni, Pawan Kumar, Ajay Soni and S. K. Sharma,
    Sensors and Actuators B: Chemical, 247, 224 (2017).
  48. Soft phonon modes driven reduced thermal conductivity in self-compensated Sn1.03Te with Mn doping,
    Somnath Acharya, Juhi Pandey and Ajay Soni
    Applied Physics Letters 109, 133904 (2016).
  49. Integration of Highly Sensitive Oxygenated Graphene With Aluminum Micro-Interdigitated Electrode Array Based Molecular Sensor for Detection of Aqueous Fluoride Anions,
    Mahesh Soni, Tarun Arora, Robin Khosla, Pawan Kumar, Ajay Soni and S. K. Sharma,
    IEEE Sensors Journal 16 (6) 1524 (2016) ,
  50. Nanomaterial Synthesis, Characterization, and Application: Editorial
    Mahmood Ghoranneviss, Ajay Soni, Alireza Talebitaher and Necdet Aslan,
    Journal of Nanomaterials, 892542 (2015)
  51. Dual Gate Tunable and High Responsivity Graphene-Based Field Effect Transistors,
    Mahesh Soni, S. K. Sharma, and Ajay Soni
    Macromolecular Symposia, Soft Materials, 357 (1) 12 (2015) ,
    Before Joining IIT Mandi
  52. Interface driven thermoelectric power of spark plasma sintered nanoplatelet composites of Bi2Te2.7Se0.3,
    Ajay Soni, S. Yiqiang, Y. Ming, Z. Yanyuan, Y. Ligen, H. Xiao, Z. Dong, M. K. K. Aik, M. S. Dresselhaus and Xiong Qihua,
    Nano Letters 12 (8) 4305 (2012)
  53. Enhanced Thermoelectric Properties of Solution Grown Bi2Te3-xSex Nanoplatelet Composites,
    Ajay Soni, Y. Zhao, Y. Ligen, M. K. K. Aik, M. S. Dresselhaus and Xiong Qihua,
    Nano Letters 12(3), 1203 (2012)
  54. Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0=x=0.3),
    G. S. Okram, N. Kaurav, Ajay Soni, A. Pal, and V. P. S. Awana,
    AIP Advances 2, 042137 (2012)
  55. Raman Spectroscopy of Few-Quintuple Layer Topological Insulator Bi2Se3 Nanoplatelets,
    Z. Jun, P. Zeping, Ajay Soni, P. Bo, Y. Zhao, J. Wang, M. S. Dresselhaus, and Q. Xiong,
    Nano Letters 11 (6), 2407–2414 (2011).
  56. Magneto-resistance, thermal conductivity, thermo-electric power and specific heat of superconductor Gd0.95Pr0.05Ba2Cu2.94M0.06O(7-d) (M=Fe, Ni, Zn and Mn),
    T. Chakraborty, B. Gahtori, Ajay Soni, G. S. Okram, S. K. Agrawal, S. Y. Chen, Y. K. Kuo, M. A. H. Ahsan, Ashok Rao,
    Solid State Communications, 151(17), 1117-1121 (2011).
  57. High Coercive Field and Magnetization Reversal in Core-shell Cum Nanotwin Driven Ni/NiO Nanospheres,
    G. S. Okram, Ajay Soni, D. T. Adroja, N. P. Lalla, and T. Shripathi J. Nanosci. Nanotechnol. 11, 2632-2635 (2011).
  58. The pH-controlled particle size tuning of nanocrystalline Ni in polyol synthesis method without additional cappant,
    G. S. Okram, Ajay Soni and R. Prasad, Adv. Sci. Lett., 4, 132–135 (2011).
  59. Electrical and thermal properties of bulk superconductors Eu0.95Pr0.05Ba2(Cu1-xMx)3O7-? (M=Fe, Ni, Zn and Mn), 
    T. Chakraborty, B. Gahtori, Ajay Soni, G. S. Okram, S. K. Agarwal, Y.-S. Chen, Y.-K. Kuo, Geetha, A. Rao, C. K. Sarkar,
    Physica C: Superconductivity, 470, 244 (2010).
  60. Negative thermopower of over doped Bi2Sr2CaCu2O8 superconductor, J. K. Bains, M. Mudgel,
    G. S. Okram, Ajay Soni, V. P. S. Awana, P. K. Ahluwalia, R. B. Saxena, H. Kishan, Physica C: Superconductivity, 470, S203 (2010).
  61. The unusual electrical response in polyaniline - threonine composites,
    T. Mathavan, S. Umapathy, M.A. Jothirajan, M. Fatima Parveen, T.S. Vivekanandam, Ajay Soni, G. S. Okram, V. Ganesan,
    Materials Letters 64, 2009 (2010).
  62. Effect of Mn substitution on the thermo-power of the superconductor Mg1-xMnxB2,
    A. Rao, T. Chakraborty, B. Gahtori, C. Sarkar, S. K. Agarwal, Ajay Soni, G. S. Okram, Journal of Physics: Conference Series 234, 012033 (2010).
  63. Size dependent thermopower in nanocrystalline nickel, Ajay Soni and G. S. Okram,
    Appl. Phys. Lett. 95, 013101 (2009). (Virt. J. Sci. Technol. 20th July 2009).
  64. Anomalous Thermoelectric power of over-doped Bi2Sr2CaCu2O8 superconductor,
    V. P. S. Awana, J. K. Bains, G. S. Okram, Ajay Soni and H. Kishan,
    J. Appl. Phys. 106, 096102 (2009).
  65. Electrical properties of polyaniline doped with metal ions,
    J. B. M. Krishna, A. Saha, G. S. Okram, Ajay Soni, S. Purakayastha and B. Ghosh,
    J. Phys. D: Appl. Phys. 42, 095404 (2009).
  66. Resistivity and thermopower measurement set-ups in the temperature range of 5-325 K, Ajay Soni and G. S. Okram,
    Rev. Sci. Instru. 79, 125103 (2008).
  67. Anomalous electrical transport in nanocrystalline nickel, G. S. Okram, Ajay Soni and R. Rawat,
    Nanotechnology, 19, 185711 (2008).
  68. Grain size effect on lattice of Ni nanocrystals prepared through polyol method, G. S. Okram, K. N. Devi, H. Sanatombi, Ajay Soni, V. Ganesan and D. M. Phase,
    J. Nanosci. Nanotech. 8, 4127 (2008).
  69. Thickness dependent structural, electronic and optical properties of Ge- nanostructures, S. Tripathi, R. Brajpuriya, A. Sharma, Ajay Soni, G. S. Okram, S. M. Chaudhari and T. Shripathi,
    J. Nanosci. Nanotech 8, 2955 (2008).
  70. Low temperature electrical resistivity of cupric telluride thin films, K. Neyvasagam, N. Soundararajan, Ajay Soni, G. S. Okram, and V. Ganesan, Phys. Stat. Solid. (b) 245, 77 (2008).
  71. Sonochemical Synthesis of Poly (Methyl Acrylate), M. A. J. Rajan, T. Mathavan, T. S. Vivekanandam, S. Umapathy, V. Ganesan, G. S. Okram and Ajay Soni, Sol. Sta. Phenom., 136, 175 (2008).
  72. Ammoximation of Cyclohexanone over nanoporous TS-1 using UHP as an Oxidant, S. Saxena, J. Basak, N. Hardia, R. Dixit, S. Bhadauria, R. Dwivedi, R. Prasad, Ajay Soni, G. S. Okram, and Ajay Gupta,
    Chem. Eng. J. 132, 61 (2007).

Patents

  1. One Step, Low Temperature, Cost Effective, Photo-Chemical Reduction of Graphene Oxide Dispersions for the Commercial Scale Analogous reduced graphene oxide (αr-GO) Production,
    Mahesh Soni, Pawan Kumar, S. K. Sharma and Ajay Soni,
    Patent Application Nunber 201611028125, Publication Date 02/09/2016

Conferences

  1. Light Matter Interactions and Many Body Phenomena in Chalcogenide Materials,
    Ajay Soni, Invited talk in conference on "Frontiers of Materials", organized by Oxford INstruments and JNCASR, Bangalore on March 14th, 2023.
  2. Physics at Nanoscale: The Science of the Invisible,
    Ajay Soni, Invited session for inservice Course for PGT Physics Teacher of Kendriya Vidyalaya Sangathan across India, organized by ZIET, MYSURU on December 25th, 2021.
  3. Crystalline Anharmonicity and Thermoelectric Properties of Bi-Ge-Te Materials with an Intrinsic van der Waal Heterostructure,
    Ajay Soni, Invited talk in Thermoelectric Symposium of Materials Research Society of India Conference, during December 20-23, 2021. Dr. Soni also co-organized the symposium and chaired the session.
  4. Chalcogenide materials doe waste heat recovery using thermoelectric technology,
    Ajay Soni, Two invited sessions in a faculty development program by Shri Mata Vaishno Devi University, Katra, December 22nd, 2021.
  5. Physics at Nanoscale: The Science of Invisible,
    Ajay Soni, INvited talk in a Physics Fest organized by Indian Physics Association (Indore Chapter) and SICA College Indore on June 5th, 2021.
  6. "Scientific Research: Planning and Execution,
    Ajay Soni, Invited talk in faculty development program by Teaching Learning Center, organized by Central University of Rajasthan, Kishangarh, Rajasthan.
  7. Carbon Materials and Their Applications in Flexible Electronics,
    Ajay Soni, Invited talk in 2 weeks Refresher Course in Sciences: Organic Electronics (online), organized at UGC-Human Resource Development Centre (HRDC), by University of Rajasthan, Jaipur, Rajasthan, India during Feb 2021.
  8. Light Matter Interactions in Metal Chalcogenides and Technological Applications,
    Ajay Soni, INvited talk in International Conference on Multifunctional Nanomaterials (ICMN2020), organized by Manipal University Jaipur, Jaipur, Rajasthan, India during December 28-30, 2020.
  9. "Scientific Research: Planning and Execution,
    Ajay Soni, in an online workshop on research methodology for faculty development program held at Indore Institute of science and Technology, Indore and organized by Rajiv Gandhi Prodhyogiki Univeristy, Bhopal.
  10. Thermal transport properties of chalcogenide materials: Role of structural defects and advantages
    Ajay Soni, Institute Colloquim talk at S. N. Bose National Centre for Basic Sciences on Deceber 31st, 2019.
  11. Soft Phonon Modes and Thermal Transport Properties of Doped Tin Telluride
    Ajay Soni, Invited talk in three-day thematic workshop on “Physics at Low temperatures and High magnetic fields (LTHM)” in association with Indian Physics Association, Indore chapter, held at UGC-DAE Consortium for Scientific Research, Indore during May. 29-31, 2019. Dr. Soni also chaired a session in the conference.
  12. Ultrathin Layered Materials for Optoelectronics and Flexible Electronic Applications
    Ajay Soni, Invited talk in International Conference on Functional Nanomaterials (ICFNM-2019), held at Indian Institute of Technology, Banaras Hindu University, Varanasi during Feb. 22-15, 2019. Dr. Soni also chaired a session in the conference.
  13. Understanding Transport Properties of Bulk Chalcogenides
    Ajay Soni, Invited talk in The 30th Annual General Meeting of MRSI and the First Indian Materials Conclave held at the Indian Institute of Science, Bangalore, India during Feb 12-15, 2019. Also co-organizer/chair of Thermoelectric Symposium in the same meeting.
  14. Nanoscale Two Dimensional Layered Materials for Optoelectronics and Flexible Electronics Applications
    Ajay Soni, Invited talk in 3rd International Conference on Soft Materials, Organized by MNIT Jaipur, INDIA, December 09-14, 2018.
  15. Understanding Transport Properties of Bulk Chalcogenides
    Ajay Soni, Invited talk in Two day Symposium on Thermoelectric Materials, Devices and Systems, Organized by Nanotech Research Innovation & Incubation Centre and PSG Institute of Technology, Coimbatore December 10-11, 2018.
  16. Thermoelectric Performance through Band Modification and Phonon Engineering in Doped SnTe
    Somnath Acharya, JuhiPandey and Ajay Soni, Invited talk in India-UK workshop on Thermoelectric Materials for Waste-Heat Harvesting, Organized by The Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR, India) and the University of Reading (UK), January 8-10, 2018.
  17. Structural Complexities and Confinement Effects in Layered Materials at Extreme Nanoscale
    Ajay Soni, Invited talk for Material Science Group Seminar, IGCAR, Kalpakkam, TN, January 2, 2018.
  18. State of the Art Thermoelectric Materials for Heat Energy Conversion
    Ajay Soni, Invited talk in National Conference on Recent Trends in Experimental and Theoretical Physics (NCRTETP - 2017), SS University, Palampur, November 23-24, 2017.
  19. Graphene Derivatives at Nanoscale and Applications
    Ajay Soni, Invited talk in Conference on "Sepctroscopy of Emerging Functional Materials” (SEFM-2017), School of Basic Sciences, Indian Institute of Technology Mandi, October 9-10, 2017.
  20. Functionalization of Graphene Oxide Dispersions for Conductive Inks and Supercapacitor Applications
    Mahesh Soni, Ajay Soni and Satinder K Sharma, Conference on "Sepctroscopy of Emerging Functional Materials” (SEFM-2017), School of Basic Sciences, Indian Institute of Technology Mandi, October 9-10, 2017. Mahesh won third prize for poster presentation .
  21. Structural Complexities and Confinement Effects in Layered Materials at Nanoscale,
    Ajay Soni, Invited talk in National Conference on "Physics at Small Scales and Advanced Materials” (PSAM-2017), School of Physics, University of Hyderabad, September 8-9, 2017.
  22. Role of Structural Defects and Soft Phonon Modes in Doped Tin Telluride for Thermoelectric Applications,
    Ajay Soni, Invited talk in International Conference on Materials for Advanced Technologies (ICMAT -2017), Symposium DD-02: Chalcogenide based materials innovations for Thermoelectrics I , June 19-23, 2017.
  23. Structural Intricacies in Chalcogenide Materials: Causes and Effects on Thermoelectric Properties,
    Ajay Soni, Invited talk in National Symposium on Technologically Advanced Functional Materials (NSTAFM-2017), Central University of Rajasthan, Kishangarh,Rajasthan, March 16-17, 2017.
  24. Confinement Effects and Phonon Modes in Layered Chalcogenides at Extreme Nanoscale,
    Ajay Soni, Invited talk in International Conference on "Advances in Biological Systems and Materials Science in NanoWorld" (ABSMSNW-2017), IIT BHU, Varanasi, UP, February 19-23, 2017.
  25. Rapid Characterization of Transition Metal Di-Chalcogenides Monolayers by Light-Matter Interactions,
    Juhi Pandey and Ajay Soni, International Conference on "Advances in Biological Systems and Materials Science in NanoWorld" (ABSMSNW-2017), IIT BHU, Varanasi, UP, February 19-23, 2017. Juhi Pandey won second prize for the best technical presentation .
  26. Soft Phonon Modes and Structural Defects in Thermoelectric Materials for Heat Energy Conversion,
    Ajay Soni, Invited talk in 2nd International Conference on Soft Materials (ICSM-2016), MNIT Jaipur, December 12-16, 2016.
  27. Structural Complexity and Phonons in Thermoelectric Materials,
    Ajay Soni, Invited talk in International Conference of Young Researchers on Advanced Materials (IUMRS-ICYRAM 2016), IISc Bangalore, December 11-15, 2016.
  28. Interfaces and defects in bulk thermoelectric nanocomposites of layered chalcogenides,
    Ajay Soni, Invited Talk in Energy materials Nanotechnology (EMN 2016), Prague, Czech Republic, During June 21-24, 2016.
  29. Thermoelectric Power Enhancement in Bulk-Composite of Doped Chalcogenides,
    Somnath Acharya and Ajay Soni, European Materials Research Society Spring Meeting, Lille, France, during May 2-6, 2016.
  30. Light-Matter Interaction in Monolayers of Semiconducting Transition Metal Di-Chalcogenides,
    Juhi Pandey and Ajay Soni, Frontiers in Light-Matter Interaction 2016, at Indian Institute of Technology Ropar, Rupnagar, Punjab, during March 4-5, 2016.
  31. Improved Thermoelectric Performance in Manganese Doped Tin Telluride,
    Somnath Acharya and Ajay Soni, International Conference on Materials Science & Technology (ICMTech -2016), University of Delhi, during 01 - 04 March, 2016.
  32. Thermoelectric Performance of Bulk Composites of 2D Nanoplatelet,
    Ajay Soni, Invited talk in "Recent Trends in Thermoelectric Materials : Fundamentals to Applications", 2nd Indo-US workshop on Thermoelectrics, during December 15-17, 2014 at National Physical Laboratory, New Delhi.
  33. Dual Gate Tunable and High Responsivity Graphene Based Field Effect Transistor,
    Mahesh Soni, Satinder Kumar Sharma, Ajay Soni, International Conference on Soft Materials- ICSM2014, during 06-10 October, 2014, held at MNIT, Jaipur, India.
  34. Role of Interfaces in Thermoelectric Performance of Bulk Nanocomposites,
    Ajay Soni and Q. Xiong, Invited talk in International Union of Materials Research Society, International Conference in Asia - 2013 (IUMRS-ICA 2013), Decmber 16-21st, 2013, held at IISc Bangalore, India.
  35. Interface crystallization and thermoelectric performance of n-type Bi2(Te/Se)3 nanoplatelet composites,
    Ajay Soni and Q. Xiong, International Conference on Advanced Materials (IUMRS-ICAM 2013) Qingdao, China.
  36. Ambipolarity in the Performance of Thin WS2 Device Due to Extrinsic Effects
    Ajay Soni, C. Leiqiang, Z. Ghorannevis and Goki Eda, ICMAT 2013, Singapore.
  37. Interface crystallization and thermoelectric performance of n-type Bi2(Te/Se)3 nanoplatelet composites,
    Ajay Soni, Y. Zhao, Y. Shen, M. Yin, L.Yu, X. Hu, Z. Dong, K. K. Aik, M. S. Dresselhaus and Q. Xiong, E-MRS 2013, SPRING MEETING, Strasbourg, France.
  38. Energy Filtered Enhancement of Thermoelectric Properties of Spark Plasma Sintered Bi2Te3-xSex Nanoplatelet Composites,
    Ajay Soni, Y. Zhao, Y. Shen, M. Yin, L.Yu, X. Hu, Z. Dong, Khiam Aik Khor, Mildred S. Dresselhaus and Qihua Xiong, MRS Fall, November 2012.
  39. Fewer Quintuple Layer Topological Insulator Bi2Se3 Nanoplatelets: Polyol Synthesis and Raman Spectroscopy,
    Qihua Xiong, Jun Zhang, Zeping Peng, Ajay Soni, Yanyuan Zhao, Bo Peng, IPS Meeting, Singapore (2011)
  40. Magnetism in nanostruturally twinned core-shell nickel,
    Ajay Soni and G. S. Okram, The 2008 Asian Conference on Nanoscience and Nanotechnology (ASIA NANO-2008), Singapore.
  41. Synthesis and Characterization of Gold Nanoparticles in Mesoporous Titanium Silicate for Catalysis,
    S. Saxena, Ajay Soni, G. S. Okram and R. Prasad, II International Symposium on Materials Chemistry (Dec. 2008), Bhabha Atomic Research Center, Mumbai.
  42. Shape and size dependent red shift in surface plasmon absorption band of nanocrystalline silver,
    Ajay Soni, G. S. Okram and V. Ganesan, Indo-Australian Symposium on Multifunctional Nanomaterials, Nanostructures and Applications (Dec 2007), Delhi University, Delhi, India.
  43. Thickness dependent structural, transport and optical properties of Ge nanostructures,
    S. Tripathi, A. Sharma, R. Brajpuriya, Ajay Soni, G. S. Okram and T. Shripathi, 8th International Conference on Nanostructured Materials (Nano-2006), Indian Institute of Science, Bangalore.
  44. Grain Size Effect on Lattice of Ni Nanocrystals Prepared Through Polyol Method,
    G. S. Okram, K. N. Devi, H. Sanatombi, Ajay Soni, V. Ganesan, and D. M. Phase, International conference on Advance Nanomaterials 2007,
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