Divya Rawat

Publications

Electron-Phonon Coupling in layered Charge-density-wave and Superconducting materials

My research work focuses on the understanding of strongly correlated quantum phenomena such as Kohn anomaly, charge-density-wave, spin-orbit coupling, and superconductivity using low-temperature transport and Raman spectroscopy. Interested material are two-dimensional layered transition metal dichalcogenides and rare-earth tritellurides

Current Research Work:- Probing of Charge Density Wave using Point-Contact Spectroscopy and Scanning Tunnelling Microscopy.

Expertise:- Growth of single crystal using Bridgman and tube furnace, Handling of Raman Spectrometer, Physical Property Measurement System (PPMS), X-ray diffractometer, Sputtering system for thin film deposition

Contacts

Dr. Divya Rawat

Assistant Professor

Department of Applied Sciences (Physics),

JIMS Engineering Management Technical Campus, Greater Noida, India

Phone no:- 9650767365

Email id:- divyarawat131@gmail.com

Ph.D. Supervisor:- Prof. Ajay Soni

Prof. Ajay Soni,

Professor

School of Physical Sciences, Indian Institute of Technology Mandi,

Mandi 175075, Himachal Pradesh, India

Phone: 01905-267854 (O)

HomePage: http://faculty.iitmandi.ac.in/~ajay/

Associate Editor: MaterialsLab and Young Leaders Committee of Editorial Board, Wiley Energy & Environmental Materials

PhD Research Work

Title of Thesis:- Quantum Multibody Phenomena In Charge Density Wave Materials Probed By Light-Matter Interaction

My research interest lies in the area of low-temperature experimental condensed matter physics, particularly focusing on the study of charge density waves and strongly correlated phenomena in two-dimensional chalcogenides layered materials. To a brief note about charge density wave, which can be defined by the electronic charge modulation accompanying the lattice distortion in the material. The major outcomes are the exploration of the electron-phonon coupling, which drives the charge density wave instabilities, and detailed analysis of the phonon dynamics of emerging collective excitations due to lattice reconstruction using Raman Spectroscopy. Interestingly, the origin and symmetry of the two-phonon mode (not existing in phonon's calculation but observed in Raman spectra) have been emphasized with the analysis of optical technique and density functional theory. In addition, the role of dimensionality, and symmetry breaking have also been addressed to unravel the thickness dependence of the charge density wave transition. Another highlight of the research work is the estimation of the Raman tensor along different crystallographic directions through angle-dependent polarization Raman spectroscopy. The important aspects of multiple charge density wave ordering with magnetism have also been studied in a new class of materials rare-earth tellurides to explore electron-phonon and spin-phonon coupling.

Academic Qualification

PhD. Physical Science, Indian Institute of Technology Mandi, Himachal Pradesh, India, 2019-2024
M. Sc. Physics, Sant Longowal Institute of Engineering and Technology, India, 2016-2018.
B. Sc., Physics Hons. Motilal Nehru College, University of Delhi, India, 2013-2016

Research and Work Experience

Assistant Professor, JEMTEC Noida (1st Aug 2025 - Ongoing)
Post-doctoral Research Fellow, IISER Mohali (7th Oct 2024 – 22nd July 2025)
Senior Research Fellow, IIT Mandi (1st July 2021- 2nd Aug 2024),
Exchange Visiting Scholar, Linkoping University, Sweden: 14th Sept 2022 – 14th Nov 2022.
Junior Research Fellow, IIT Mandi (2nd Aug 2019- 30th June 2021)

Awards and Achievements

Best PhD Thesis Award at 68th DAE-Solid State Symposium organized by Bhanbha Atomic Research Center (18th-22nd Dec 2024)
Best Poster award in Advanced Material for Better Tomorrow (AMBT-2023)
Best Technical presentation award on the National Science day in IIT Mandi (One Day Physics Workshop)
Best Poster award in DAE-2021
Teaching assistantship (TA) award on the 12th foundation day in IIT Mandi (Feb, 2021)
GATE qualified (2019-physical sci.)
GATE qualified (2018-physical sci.)
IIT-Jam qualified (2016-physical sci.)
Awarded with first prize by Education Minister (Manish Shishodhiya ) for Academic in graduation (B.Sc).

Best Teaching Assistent Award in IIT Mandi-2021

Best Poster Award in AMBT-2023

Best Oral Presentation Award in National Science Day-2023 in IIT Mandi

Best Poster Award in DAE-SSPS-2022

Best PhD Thesis Award in DAE-SSPS 2024

Experimental and Technical Skills

Single-crystal growth using the chemical vapor transport and melt-grown technique
Handling Glass-blowing system for high vacuum sealing of quartz tube.
Low-temperature and high-temperature Raman Spectroscopy (Horriba LabRAM HR Evolution)
Low-temperature measurement using Physical Property measurement system (PPMS-Dynacool Quantum Design)
Deposition of thin films using DC Magnetron Sputtering
I-V measurement using Labview Programming
Others: X-ray diffraction, Origin, Full-Proof Software, Nano-hub analysis, Endnote,Vesta.

Professional Experience

Two-month lab visit to Linkoping University, Sweden in the "Thin film Division" with Professor Per Eklund's group.
Teaching Assistantship for PH301 Quantum Mechanics course (2023) at IIT Mandi
Teaching assistantship for PH501 Solid state physics course (2023) at IIT Mandi
Teaching assistantship for PH523 Condensed matter physics course (2022) at IIT Mandi
Teaching assistantship for PH601 Mesoscopic physics course (Aug-Dec 2021) at IIT Mandi
Teaching assistantship for high end Raman spectroscopy facilty (2020-2021) at IIT Mandi
Teaching assistantship for IC22P BTech Electronics lab (2019) at IIT Mandi
Have an experience of taking Tutorial, making Question paper in both online and offline mode
Two months of teaching experience at New Adarsh Public School as a TGT (science) post. (March-May) 2019 in U.P, India

Publications

13. “Emergence of spin-phonon coupling in Gd-doped Y2CoMnO6 double perovskite oxide: a combined experimental and ab-initio study”; A. Khan, D. Banerjee, D. Rawat, T.K Nath, A. Soni, S. Chatterjee, A.Taraphder, Phys. Chem. Chem. Phys., 2025.

12. “Electron-phonon interactions and tensor analysis in the topological insulator Bi2Te3 using angle-resoved polarized Raman spectroscopy” A. Singh, A. Elsukova, D. Rawat, S. Talukdar, S. Saha, A. Le Febrvrier, P. O. A. Persson, P. Eklund, and A. Soni, Physical Review B, 111, 195203, 2025.

11. s-d Coupling Induced Dynamic Off-centering of Cu Drives High Thermoelectric Performance in TlCuS" A. Bhui, P. Matukumilli, S. Biswas, A. Ahad, A. Ghata, D. Rawat, M. Dutta, A. Soni, U. Waghmare, K. Biswas; Journal of the American Chemical Society, 147, 3758-3768, 2025.

10. Multiple charge density wave ordering and quantum coupling of electronic spin with zone-folded phonons in GdTe3; D. Rawat, P. Dutta, D. Negi, I. Maria, S. Saha, K. Biswas, and A. Soni* Accepted in Physical Review B, 110, 075155, 2024

9. Symmetry breaking and structure instability in ultra-thin 2H-TaS2 across charge density wave transition; D. Rawat, A. Thomas, A.P.S. Rana, C. Bera, A. Soni, Physical Review B, 109, 155411, 2024.

8. Anisotropic light-matter interactions in single crystal topological insulator bismuth selenide; D. Rawat, A. Singh, N.K. Singh, A. Soni; Physical Review B 107, 155203, 7, 2023

7. Chemically transformed Ag2Te nanowires on polyvinylidene fluoride membrane for flexible thermoelectric applications; A. Kashyap, D. Rawat, D. Sarkar, N.K. Singh, K. Biswas, A. Soni, Angewandte Chemie, e202401234, 2024.

6. Lattice instability induced concerted structural distortion in charged and van der waals layered GdTe3; P. Dutta, S. Chandra, I. Maria, K. Debnath, D. Rawat, A. Soni, U.V. Waghmare, K. Biswas Advanced Functional Materials, 2312663, 2023

5. Strong anharmonicity‐induced low thermal conductivity and high n‐type mobility in the topological insulator Bi1.1Sb0.9Te2S; R. Pathak, P. Dutta, A. Srivastava, D. Rawat, R.K. Gopal, A.K. Singh, A. Soni, K. Biswas Angewandte Chemie 61 (41), e202210783, 16, 2022

4. Electron-phonon coupling and quantum correction to topological magnetoconductivity in Bi2GeTe4; N.K. Singh, D. Rawat, D. Dey, A. Elsukova, P.O.Å Persson, P. Eklund, A. Soni Physical Review B 105 (4), 045134, 13, 2022

3. Raman spectroscopy study of phonon liquid electron crystal in copper-deficient superionic thermoelectric Cu2–xTe; J. Pandey, S. Mukherjee, D. Rawat, S. Athar, KS. Rana, R.C. Mallik, A. Soni, ACS Applied Energy Materials 3 (3), 2175, 2020

2. Multiphonon interactions and collective excitations in charge density wave of transition metal dichalcogenides; D. Rawat, J. Pandey, S. Menon, U. Waghmare, A. Soni, arXiv:2311.02371 (Manuscript Under Review 2024)

1. Emergence of spin-phonon coupling in Gd-doped Y2CoMnO6 double perovskite oxide: a combined experimental and ab-initio study; A. Khan, D. Banerjee, D. Rawat, T.K Nath, A. Soni, S. Chatterjee, A.Taraphder, arXiv:2407.02407 (Manuscript Under Review 2024)

Conference Proceeding

Optical,Electrical and Transport Properties of α-In2Se3 Crystal: Divya Rawat, Niraj Kumar Singh, Kewal Singh Rana and Ajay Soni*, Proceedings of the 65th DAE Solid State Physics Symposium 55, 734 (2021)
Synthesis and Magnetic Properties of Unusual Hexagonal Nickel Nanostructures: Ankit Kashyap, Nikita Kunwar, Divya Rawat and Ajay Soni*, Proceedings of the 65th DAE Solid State Physics Symposium 55, 318 (2021)

Conferences

Thesis presentation " Quantum Many Body Phenomena in Charge Density Wave Materials Probed by Light Matter Interaction"; Divya Rawat, and Ajay Soni*" at 68th, DAE Solid State Physics Symposium, December 18-22, 2024.
Anisotropic light-matter interaction with crystalline anisotropy in layered materials using Raman spectroscopy; Poster presentation in Advanced Material for Better Tomorrow (AMBT-2023) held at Banaras Hindu University from 10th to 13th October 2023.
Many body phenomena in bismuth chalcogenides using light-matter interaction; Oral presentation on National Science Day 2023 held at IIT Mandi on 28th February 2023.
Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Cu Deficient Superionic Thermoelectric Cu2-xTe; J. Pandey, S. Mukherjee, Divya Rawat, R. C. Malik and A. Soni, Oral presentation at European Material Research Society "EMRS-Fall 2022" 18 - 21 Sept 2022 (Poland)
High degree of crystalline anharmonicity in α-In2Se3 crystal; Divya Rawat, Niraj Kumar Singh, Kewal Singh Rana and Ajay Soni. Oral presentation at the International conference on emerging technology and functional materials (ICETFM)-2022, held at Medi-Caps University Indore, during 12-14 July 2022
Topological Matter Conference June 28-July 1, 2021 (Virtual Conference).
. Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Cu Deficient Superionic Thermoelectric Cu2-xTe; J. Pandey, S. Mukherjee, Divya Rawat, S. Athar, K.S. Rana, R. C. Malik and A. Soni, Oral presentation at Advanced Materials for Better Tomorrow: AMBT-2021.(Virtual Conference)
Oral presentation " Optical, Electrical and Transport Properties of α-In2Se3 Crystal; Divya Rawat, Niraj Kumar Singh, Kewal Singh Rana and Ajay Soni*" at 65th, DAE Solid State Physics Symposium, December 16-19, 2021 (Virtual Conference)
Summer ICTP School "School on Synchrotron Light Sources and their Applications" online from 06 to 17 December 2021. (Virtual)

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Awards and Achievements

Best Poster Award in DAE-SSPS-2022

Experimental and Technical Skills

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