Light-Matter Interaction in Two-Dimensional Materials
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कर्मण्येवाधिकारस्ते मा फलेषु कदाचन ।
मा कर्मफलहेतुर्भुर्मा ते संगोऽस्त्वकर्मणि ॥
You have the right to perform your duties, but not to claim the results of your actions.
Do not act with attachment to outcomes, nor let yourself drift toward inaction.
श्रीमद भगवद गीता 2.47
Research interests at a glance
1) Understanding the interplay between Exciton-Photon-Phonon- Electron using Raman and Photoluminescence techniques in:
Ø Semiconducting and metallic 2D layered Materials
Ø Graphene, h-BN and Black Phosphorus (BP) etc.
Ø Magnetic and Superconducting 2D layered Materials
Ø Topological Insulator and Thermoelectric Materials
2) Material characterization using Raman, PL, AFM, SEM, XPS etc.
Recently accepted/published papers
Deepu Kumar, Rajesh Kumar Ulaganathan, Raju Kalaivanan, Raman Sankar, Maeng-Je Seong, and Kwang-Yong Choi, Quasi-elastic scattering and spin-phonon coupling in Se-substituted NiPS3, Physical Review Materials 9, 114002 (2025).
Deepu Kumar, J. Khatua, N.The Hoang, Y. Sim, R. K.Ulaganathan, R.Kalaivanan, R. Sankar, Maeng-Je Seong, and Kwang-Yong Choi, Manipulation of anisotropic Zhang-Rice exciton in van der Waals antiferromagnets NiPS3-xSex by anion substitution, npj 2d materials and applications 9, 87 (2025)
A.G. Chakkar, C. B. Auti, Deepu Kumar, N. Jana, K. Pal, Pradeep Kumar, Raman signature of multiple phase transitions and quasi-particle excitations in putative Kitaev spin liquid candidate Na2Co2TeO6 , Physical Review B 112, 144417 (2025).
A. G. Chakkar, Deepu Kumar, A. Kumar, M. Kumar, and Pradeep Kumar, Tunable resonant Raman scattering with temperature in vertically aligned 2H-SnS2, Nanoscale (2025)
N. Khan, Deepu Kumar, S. Semwal, Y.Shemerliuk, B. Büchner, K. Pal, S. Aswartham, Pradeep Kumar, Short and long-range magnetic ordering and emergent topological transition in(Mn1−xNix)2P2S6. Scientific Reports 15, 4438 (2025)
Deepu Kumar, N. The Hoang, Y. Sim, Y. Choi, K. Raju, R. Kumar Ulaganathan, R. Sankar, Maeng-Je Seong, Kwang-Yong Choi, Interplay between magnetic and lattice excitations and emergent multiple phase transitions in MnPSe3-xSx, Physical Review B 110, 064414 (2024)
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