Publications

PUBLICATIONS

(google scholar page: https://scholar.google.com/citations?hl=en&user=4AjMncoAAAAJ

Submitted & Under review:

• "Ultrafast Dynamics of Spin-Orbit Entangled Excitons Coupled to Magnetic Ordering in van der Waals Antiferromagnet NiPS₃ ", Sidhanta Sahu, Anupama Chauhan, Poulami Ghosh, Sayan Routh, Ruturaj Puranik, Setti Thirupathaiah, Siddhartha Lal, Shriganesh Prabhu S., Chiranjib Mitra, and N. Kamaraju, arXiv:2509.04900 (2025). (Submitted) 

Peer reviewed

Two Dimensional Magnetic Quantum Materials

1. "Ultrafast dynamics of carriers, coherent acoustic phonons and strain pulses in BiSbTe1.5Se1.5 topological insulator thin films", Anupama Chauhan, Sidhanta Sahu, Poulami Ghosh, Dheerendra Singh, Sambhu G Nath, Anjan Kumar N M, P.K. Panigrahi, Chiranjib Mitra, N. Kamaraju, Phys. Rev. B 112, 054311 (2025). 

2. "Probing of magnetic dimensional crossover in CrSiTe3 through picosecond strain pulses",  Anjan Kumar N M, Soumya Mukherjee, Abhirup Mukherjee, Ajinkya Punjal, Shubham Purwar, Thirupathaiah Setti, Shriganesh Prabhu S, Siddhartha Lal, N. Kamaraju, Phys. Rev. B 111, L140414 (2025).

THz Spectroscopy of Materials:

3. "Investigation of magnetic order influenced phonon and electron dynamics in MnBi2Te4 and Sb doped MnBi2Te4 through terahertz time-domain spectroscopy ", Soumya Mukherjee, Anjan Kumar NM, Subhadip Manna, Sambhu G Nath, Radha Krishna Gopal, Chiranjib Mitra, N. Kamaraju, Phys. Rev. B 110, 195401 (2024).

4. "Investigation of conductivity and shielding efficiency of the free-standing PVA-GO-Ag composite thin films in terahertz regime using time domain terahertz spectroscopy", Soumya Mukherjee, Anjan Kumar NM, B. Karthikeyan and N. Kamaraju,129, Appl. Phys. A 129, 343 (2023).

Understanding ultrafast photo-excitation and the subsequent carrier dynamics in various nano and bulk insulating materials:

5. "Probing shallow and deep oxygen traps in binary transition metal-oxide, α- CoV2O6 using ultrafast pump-probe spectroscopy", Anjan Kumar N M, Soumya Mukherjee, Souvick Chakraborty, Ayan Mondal, Debabrata Samanta, Goutam Dev Mukherjee, Venkataramanan Mahalingam, Satyabrata Raj, N. Kamaraju, The Journal of Physical Chemistry C 128 (35), 14717-14725 (2024). DOI: 10.1021/acs.jpcc.4c02975 

6. "Trapping and exciton-exciton annihilation assisted ultrafast carrier dynamics in nanosheets of 2H-MoSe2 and Cr doped 1T/2H-MoSe2", Soumya Mukherjee, Anjan Kumar N M, Ayan Mondal, Venkataramanan Mahalingam, N. Kamaraju, J. Chem. Phys. 159, 164705 (2023). 

7. "Many-body interaction governed ultrafast relaxation dynamics of hot holes in CuS nanoflakes and photocatalytic efficiency enhanced CuS/Ag2S nanocomposites", Soumya Mukherjee, Anjankumar N M, Saranya Ramesh, Balasubramanian Karthikeyan, N. Kamaraju, ACS Appl. Opt. Mater., 1, 7, 1332–1342 (2023).

8. "Photo Excited Ultrafast Dynamics of Free Carriers and Polarons in V2O5 Micro-Particles through Time-resolved Non-Degenerate Pump Probe Spectroscopy", Anjankumar NM, Soumya Mukherjee,  Saranya Ramesh, Ayan Mondal, Venkataramanan Mahalingam, N. Kamaraju,   J. Phys. Chem. C., 126, 20535–20541 (2022).

9. "Investigation of self-trapped excitonic dynamics in hematite nano-forms through non-degenerate pump-probe transmission spectroscopy", Anjan Kumar N M, Soumya Mukherjee, Anoop Sunny, B. Karthikeyan, and N. Kamaraju, Appl. Phys. Lett., 121, 202102 (2022). 

10. "Ultrafast Carrier Dynamics of Undoped and Ho3+- Doped α-Bismuth Oxide Micro-Rods", Jit Sarkar, Shankar G Menon, N. Prasad, B. Karthikeyan and N. Kamaraju, J. Phys. Chem. C, 123(15), 10007 (2019).

11.  “Ultrafast electron hole plasma dynamics in chemically pristine and Ag-doped ZnO nanorods”, Jit Sarkar, Shankar G Menon, C. Madhumitha, B. Karthikeyan and N. Kamaraju, J. Appl. Physics, 124, 243103 (2018).

Review (2021) on THz Spectroscopy:

12. "A review on numerical methods for thickness determination in terahertz time-domain spectroscopy", Soumya Mukherjee, N. M. Anjan Kumar, Prashanth C. Upadhya, and N. Kamaraju, Eur. Phys. J. Spec. Top. 230: 4099-4111 (2021).

Transient THz metamaterial:

13.  “Transient GaAs Plasmonic Metasurfaces at Terahertz Frequencies “, Y. Yang, N. Kamaraju, S. Campione,  S. Liu, J L. Reno, M B. Sinclair, R P. Prasankumar, and I. Brener, ACS Photonics  4 15-21 (2017).

14.  “Sub-cycle control of terahertz waveform polarization using all-optically induced transient metamaterials”, N. Kamaraju, Andrea Rubano, Linke Jian, Surajit Saha, T. Venkatesan, Jan Nötzold, R. Kramer Campen, Martin Wolf, Tobias Kampfrath, Nature Light Science and Applications, 3, e155 (2014).

Magneto-Optical THz Spectroscopy:

15. “Magnetoelastoelectric coupling in core–shell nanoparticles enabling directional and mode-selective magnetic control of THz beam propagation”, Moumita Dutta, N. Kamaraju, Soutik Betal, Rohit P. Prasankumar, Amar S. Bhallaa and Ruyan Guo”, Nanoscale 9, 13052 (2017).

16.  “Using terahertz pulses to shed new light on quantum materials”, P Bowlan, N Kamaraju, DA Yarotski, AJ Taylor, RP Prasankumar, Infrared, Millimeter, and Terahertz waves (IRMMW-THz), IEEE, 1, 14770919 (2016).

17.  “THz Magneto-optical Spectroscopy of two dimensional hole”, N. Kamaraju, W. Pan, U. Ekenberg, D. Gvozdic, S. Boubanga-Tombet, P. C. Upadhya, J. Reno, A. J. Taylor, R. P. Prasankumar, Applied Phys. Lett. 106, 031902 (2015).

Coherent Phonons:

18. “Indication of Te segregation in laser-irradiated ZnTe observed by in situ coherent-phonon spectroscopy”, N. Kamaraju, T. Shimada, C. Frischkorn, T. Kampfrath, and M.Wolf, Appl. Phys. Lett. 105, 111908 (2014).

19. “Coherent Phonons in Pyrochlorate titanates A₂Ti₂O₇ (A = Dy, Gd and Tb): a phase transition in Dy₂Ti₂O₇ at 110K”, N. Kamaraju, Sunil Kumar, Surajit Saha, S. Singh, R. Suryanarayanan, A. Revcolevschi, and A.K. Sood, Phys. Rev. B 83, 134104 (2011). 

20.   “Large-amplitude chirped coherent phonons in tellurium mediated by ultrafast photo excited carrier diffusion“, N. Kamaraju, Sunil Kumar, M. Anija and A. K. Sood, Phys. Rev. B 82, 195202(2010).  

21. “Temperature-dependent chirped coherent phonon dynamics in Bi₂Te₃ using high intensity femtosecond laser pulses”, N. Kamaraju, Sunil Kumar, and A. K. Sood, Euro Phys. Lett. 92, 47007(2010).

22. “Influence of two phonon absorption induced free carriers on coherent polarization and phonon generation in ZnTe”, N. Kamaraju, Sunil Kumar, Eric Freysz and A. K. Sood,  J. Appl. Phys. 107, 103102(2010).

Nonlinear Optics and Electron dynamics in carbon nanotubes, graphene, BCN and gold nanorods:

23. “Femtosecond photo excited carrier dynamics in reduced graphene oxide suspensions and films”, Sunil Kumar, N. Kamaraju, K. S. Vasu and A. K. Sood, Int. J. Nanoscience 10, 669 (2011).

24.  “Graphene analogue BCN: Femtosecond non-linear optical susceptibitlity and hot carrier dynamics”, Sunil Kumar, N. Kamaraju, K. S. Vasu, A. Nag, A. K. Sood and C. N. R. Rao, Chem. Phys. Lett. 499, 152 (2010).

25. “Ultrafast dynamics of gold nanorods: Tuning between photo-bleaching and photo-induced absorption”, M. Anija, Sunil Kumar, N. Kamaraju, Neha Tiwari, S. K. Kulkarni and A. K. Sood, Int. J. Nanoscience 10, 687 (2010).

26. “Ultrafast switching time and third order nonlinear coefficients of microwave treated single walled carbon nanotube suspensions”, N. Kamaraju, Sunil Kumar, B. Karthikeyan, B. Kakade, V. K. Pillai and A. K. Sood, Journal of Nanoscience and Nanotechnology 9, 5550 (2009).

27.  “Double walled carbon nanotubes as ultrafast optical switches”, N. Kamaraju, Sunil Kumar, Y. A. Kim, T. Hayashi, H. Muramatsu, M. Endo and A. K. Sood, Applied Physics Letters 95, 081106 (2009).

28. “Femtosecond carrier dynamics and saturable absorption in graphene suspensions”, Sunil Kumar, M. Anija , N. Kamaraju, K. S. Vasu, K. S. Subrahmanyam, A. K. Sood and C. N. R. Rao, Applied Physics Letters, 95, 081106(2009).

29. “Ultrafast electron dynamics and cubic optical nonlinearity of free standing thin film of double walled carbon nanotubes”, N. Kamaraju, Sunil Kumar, B. Karthikeyan, A. Moravsky, R. O. Loutfy, and A. K. Sood, Applied Physics Letters 93, 091903 (2008).

30. “Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond Z-scan measurements”, N. Kamaraju, Sunil Kumar, S. Krishnamurthy, S. Guha, A. K. Sood, C. N. R. Rao, Applied Physics Letters 91, 251103 (2007).

Time domain THz spectroscopy:

31. “Terahertz Time Domain Spectroscopy to Detect Low‐Frequency Vibrations of Double‐Walled Carbon Nanotubes”, Sunil Kumar, N. Kamaraju, M. Tondusson, E. Freyz and A. K. Sood, European J. Inorg. Chem. 2010, 4363-4366 (2010).

32.  “Terahertz spectroscopy of single-walled carbon nanotubes in a polymer film: observation of low-frequency phonons”, Sunil Kumar , N. Kamaraju, B. Karthikeyan, M. Tondusson, E. Freyz and A. K. Sood, J. Phys. Chem. C 114, 12446-12450(2010).

33.  “Direct observation of low frequency confined acoustic phonons in silver nanoparticles; Terahertz time domain spectroscopy”, Sunil Kumar , N. Kamaraju, B. Karthikeyan, M. Tondusson, E. Freyz and A. K. Sood, J. Chem. Physics 133, 014502 - 014505 (2010).

FDTD Simulations:

34. “Asymmetric Backscattering of Ultraviolet Light by Low-Refractive Index Thin Film of Tilted Alumina Nanorods”, Xing Yan, Kamaraju Natarajan, Tanuj Saxena, and Michael Shur, CLEO Conference paper, JW2A.42 (2013).

THz Electronics:

35. “Application of Plasma-Wave Detectors for Ultra-Short Pulse Terahertz Radiation”, A. Gutin, A.V. Muraviev, N. Kamaraju, X. Shen, Y. Yamaguchi, and M.S. Shur, Infrared, Millimeter, and Terahertz waves (14770919 IRMMW-THz), 2014.

Raman spectroscopy and Laser Cooling of Rb atoms:

36. “Bilayer Interference Enhanced Raman Spectra of Single Walled carbon Nanotubes”, N. Kamaraju, S. Balaji, D. V. S. Muthu, S. Mohan, and A. K. Sood, Chemical Physics Letters 423 , 266 (2006).

37.  “Raman Scattering in CaFeO3 and La0:33Sr0:67FeO3 across the charge disproportionation phase transition”, S. Ghosh, N. Kamaraju, M. Seto, A. Fujimori, Y. Takeda, S. Ishiwata, S. Kawasaki, M. Azuma, M. Takano and A. K. Sood, Physical Review B 71, 245110 (2005). 

38. “Observation of narrow fluorescence from doubly-driven four-level atoms at room temperature”, U. K. Khan, J. Sebastian, N. Kamaraju, N. Andal, R. Srinivasan and Hema Ramachandran, Euro physics Letters, 67, 35 (2004).