Light-Matter Interaction in Two-Dimensional Materials
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कर्मण्येवाधिकारस्ते मा फलेषु कदाचन ।
मा कर्मफलहेतुर्भुर्मा ते संगोऽस्त्वकर्मणि ॥
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
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)
S. Deswal, Deepu Kumar, D. Rout, S. Singh, and Pradeep Kumar, Quasi-two-dimensional frustrated spin-1 triangular lattice antiferromagnet Ca3NiNb2O9: A proximate spin liquid, Phy. Rev. B 110, 024430(2024)
N. Khan, Deepu Kumar, V. Kumar, Y. Shemerliuk, S. Selter, B. Büchner, K. Pal, S. Aswartham, Pradeep Kumar, Interplay of topology and antiferromagnetic order in two-dimensional van der Waals crystals of (NixFe1-x)2P2S6, 2D Materials 11, 035018 (2024)
A. G. Chakkar, Deepu Kumar, Pradeep Kumar, Broken weak and strong spin rotational symmetries and tunable interaction between phonon and the continuum in Cr2Ge2Te6, Phys. Rev. B 109, 134406 (2024)
V. Kumar, Deepu Kumar, B. Singh, Y. Shemerliuk, M. Behnami, B. Buchner, S. Aswartham, Pradeep Kumar, Fluctuating Fractionalized Spins in Quasi Two-dimensional Magnetic V0.85PS3, Physical Review B 107, 094417 (2023)
A. Mehta, Deepu Kumar, S. Dwivedi, S. Kumar, and Pradeep Kumar, Phonon dynamics in lead free perovskite (1-x) KNN-xBAN (x= 0.0–0.1): a temperature dependent raman study, Physica Scripta 98, 035711(2023)
Deepu Kumar, R. Kumar, M. Kumar and Pradeep Kumar, "Coupled excitonic quasiparticles-electron-phonon and interlayer coupling in vertically and horizontally aligned MoS2 " Journal of Materials Chemistry C 10, 5684 (2022)
Deepu Kumar, V. Kumar, R. Kumar, M. Kumar and Pradeep Kumar, "Electron-phonon coupling, thermal expansion coefficient, resonance effect, and phonon dynamics in high-quality CVD-grown monolayer and bilayer MoSe2" Phys. Rev. B 105, 085419 (2022)
B. Singh, Deepu Kumar, V. Kumar, M. Vogl, S. Wurmehl, S. Aswartham, B. Büchner and Pradeep Kumar, “Fractional Spin fluctuations and quantum liquid signature in Gd2ZnIrO6” Phys. Rev. B 104,134402, (2021)
Deepu Kumar, B. Singh, R. Kumar, M. Kumar and P. Kumar, “ Davydov Splitting, Resonance Effect and Phonon Dynamics in CVD grown Layered MoS2 ”, Nanotechnology 32, 285705 (2021)
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