Publications

You can also find my articles on my Google Scholar profile.

Journal Articles

Pump fluence dependent carrier dynamics at the A-exciton of MoS₂: Monolayer vs. Bulk

Published in arXiv, 2024

We investigated carrier dynamics in monolayer and multilayer MoS₂ at photo-doping densities near the Mott limit. Despite similar band structures near the K-point, marked differences emerge due to exciton dissociation, bandgap renormalization, and intervalley relaxation, offering key insights into MoS₂ optoelectronics.

Recommended citation: Khatua, D. P., Singh, A., Gurung, S., and Jayabalan, J. (2024). "Pump fluence dependent carrier dynamics at the A-exciton of MoS₂: Monolayer vs. Bulk." arXiv:2407.05038. https://doi.org/10.48550/arXiv.2407.05038
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Excitation density-dependent carrier dynamics in a monolayer MoS₂: Exciton dissociation, formation and bottlenecking

Published in Micro and Nanostructures, 2022

This study explores transient carrier dynamics in monolayer MoS₂ at high excitation densities, a regime important for applications in lasers, optical parametric amplifiers, and high-power detectors. The optical response shows that carriers, excited directly to the A-exciton state, undergo exciton dissociation and hot-carrier generation, followed by exciton formation on the picosecond timescale. At elevated fluences, excitons display longer lifetimes, indicating a bottlenecking process. These fluence-dependent relaxation pathways are crucial for optimizing MoS₂-based optoelectronic devices.

Recommended citation: Khatua, D. P., Singh, A., Gurung, S., and Jayabalan, J. (2022). "Excitation density-dependent carrier dynamics in a monolayer MoS₂: Exciton dissociation, formation and bottlenecking." Micro and Nanostructures, 165, 207205. https://doi.org/10.1016/j.micrna.2022.207205
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A comparative study of ultrafast carrier dynamics near A, B, and C-excitons in a monolayer MoS₂ at high excitation densities

Published in Optical Materials, 2022

Comparative study of ultrafast carrier dynamics near A, B, and C-excitons in monolayer MoS₂ at high excitation densities, revealing distinct excitonic behaviors.

Recommended citation: Khatua, D. P.^*, Singh, A., Gurung, S., Tanwar, M., Kumar, R., and Jayabalan, J. (2022). "A comparative study of ultrafast carrier dynamics near A, B, and C-excitons in a monolayer MoS₂ at high excitation densities." Optical Materials, 126, 112224. https://doi.org/10.1016/j.optmat.2022.112224 [^*Corresponding author]
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Ultrafast carrier dynamics in a monolayer MoS₂ at carrier densities well above Mott density

Published in Journal of Physics: Condensed Matter, 2022

Investigation of ultrafast carrier dynamics in monolayer MoS₂ at carrier densities far exceeding the Mott threshold, revealing fundamental excitonic behavior under extreme photoexcitation.

Recommended citation: Khatua, D. P., Singh, A., Gurung, S., Khan, S., Tanwar, M., Kumar, R., and Jayabalan, J. (2022). "Ultrafast carrier dynamics in a monolayer MoS₂ at carrier densities well above Mott density." Journal of Physics: Condensed Matter, 34(15), 155401. https://doi.org/10.1088/1361-648X/ac4dbf
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Ultrafast carrier dynamics in Ag–CdTe hybrid nanostructure: non-radiative and radiative relaxations

Published in Journal of Physics: Condensed Matter, 2021

We studied ultrafast carrier dynamics in Ag–CdTe hybrid nanostructures, highlighting the competition between non-radiative and radiative pathways in determining their optical response.

Recommended citation: Gurung, S., Khatua, D. P., Singh, A., and Jayabalan, J. (2021). "Ultrafast carrier dynamics in Ag–CdTe hybrid nanostructure: non-radiative and radiative relaxations." Journal of Physics: Condensed Matter, 33(18), 185702. https://doi.org/10.1088/1361-648X/abeebe
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Static and ultrafast optical response of two metal nanoparticles glued with a semiconductor quantum dot

Published in Photonics and Nanostructures: Fundamentals and Applications, 2021

Exploration of static and ultrafast optical properties of hybrid systems formed by two metal nanoparticles coupled via a semiconductor quantum dot.

Recommended citation: Gurung, S., Singh, A., Khatua, D. P., Srivastava, H., and Jayabalan, J. (2021). "Static and ultrafast optical response of two metal nanoparticles glued with a semiconductor quantum dot." Photonics and Nanostructures: Fundamentals and Applications, 43, 100869. https://doi.org/10.1016/j.photonics.2020.100869
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Filtering noise in time and frequency domain for ultrafast pump–probe performed using low repetition rate lasers

Published in Review of Scientific Instruments, 2020

This work demonstrates time- and frequency-domain noise filtering strategies for ultrafast pump–probe spectroscopy with low repetition rate lasers, improving signal-to-noise ratio in femtosecond experiments.

Recommended citation: Khatua, D. P., Gurung, S., Singh, A., Khan, S., Sharma, T. K., and Jayabalan, J. (2020). "Filtering noise in time and frequency domain for ultrafast pump–probe performed using low repetition rate lasers." Review of Scientific Instruments, 91(10), 103901. https://doi.org/10.1063/5.0010449
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Conference Proceedings

Nanophotonic control of high-energy light–materials interaction

Published in CLEO 2023, Optica Publishing Group, Technical Digest Series, paper JTh2A.79, 2023

Proceeding paper on nanophotonic control of high-energy light–material interactions, published in the CLEO 2023 Technical Digest.

Recommended citation: Shafirin, P., Feng, P., Khatua, D. P., and Davoyan, A. (2023). "Nanophotonic control of high-energy light–materials interaction." Technical Digest Series (Optica Publishing Group), paper JTh2A.79, CLEO 2023. https://doi.org/10.1364/CLEO_AT.2023.JTh2A.79
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Ultrafast photoexcited carrier dynamics of monolayer MoS₂ near the band edge above Mott density

Published in 37th M.P. Young Scientist Congress, March 14–17, 2022, 2022

Proceeding paper on ultrafast carrier dynamics in monolayer MoS₂ near the band edge under excitation densities above the Mott threshold, presented at the 37th M.P. Young Scientist Congress.

Recommended citation: Khatua, D. P. (2022). "Ultrafast photoexcited carrier dynamics of monolayer MoS₂ near the band edge above Mott density." 37th M.P. Young Scientist Congress, March 14–17, 2022.

A comparison of the transient optical response of a monolayer MoS₂ near its A, B, and C excitons

Published in 65th DAE Solid State Physics Symposium, Bhabha Atomic Research Centre, Mumbai, India, December 15–19, 2021, 2021

Proceeding paper comparing the transient optical response of a monolayer MoS₂ near the A, B, and C excitons, presented at the 65th DAE Solid State Physics Symposium.

Recommended citation: Khatua, D. P., Gurung, S., Singh, A., Khan, S., and Jayabalan, J. (2021). "A comparison of the transient optical response of a monolayer MoS₂ near its A, B, and C excitons." 65th DAE Solid State Physics Symposium, Bhabha Atomic Research Centre, Mumbai, India, December 15–19, 2021.

Conference Presentation & Contributions

Ultrafast plasmon dynamics under high-intensity laser excitation

Presented at: CLEO 2025, Long Beach, CA, USA, May 4–9, 2025, May 04, 2025

We presented out study on plasmon excitation and dynamics under high-intensity femtosecond pulsed laser illumination (10¹²–10¹⁶ W/cm²) using particle-in-cell (PIC) simulations. We show how plasmons can be used to control light-matter interaction at the nanoscale

Recommended citation: Khatua, D. P., Shafirin, P., Joly-Jehenne, T., and Davoyan, A. (2025). "Ultrafast plasmon dynamics under high-intensity laser excitation." CLEO 2025, Long Beach, CA, USA, May 4–9, 2025 (Poster Presentation).

Plasmon dynamics under high-intensity illumination

Presented at: MRS Spring Meeting & Exhibit, Seattle, Washington, USA, April 7–11, 2025, April 07, 2025

We presented our study on plasmon excitation and dynamics under high-intensity femtosecond pulsed laser illumination using particle-in-cell (PIC) simulations, highlighting how plasmons can be exploited to control light–matter interactions at the nanoscale.

Recommended citation: Khatua, D. P., Shafirin, P.^†, Joly-Jehenne, T., and Davoyan, A. (2025). "Plasmon dynamics under high-intensity illumination." MRS Spring Meeting & Exhibit, Seattle, Washington, USA, April 7–11, 2025. [^†Presenting Author]

Effects of thin films on the dynamics of nanosecond laser ablation

Presented at: MRS Spring Meeting & Exhibit, Seattle, Washington, USA, April 7–11, 2025, April 07, 2025

We presented our study on how thin films influence the dynamics of nanosecond laser ablation, with implications for laser–matter interaction and material processing.

Recommended citation: Shafirin, P.^†, Khatua, D. P., and Davoyan, A. (2025). "Effects of thin films on the dynamics of nanosecond laser ablation." MRS Spring Meeting & Exhibit, Seattle, Washington, USA, April 7–11, 2025. [^†Presenting Author]

Plasmon excitation under extreme-intensity laser pulses

Presented at: APS Joint March Meeting and April Meeting, Anaheim, CA, USA, March 16–21, 2025, March 16, 2025

We presented our work on plasmon excitation under extreme-intensity femtosecond laser pulses, exploring nonlinear light–matter interactions at the nanoscale.

Recommended citation: Khatua, D. P., Shafirin, P., Joly-Jehenne, T., and Davoyan, A. (2025). "Plasmon excitation under extreme-intensity laser pulses." APS Joint March Meeting and April Meeting, Anaheim, CA, USA, March 16–21, 2025 (Oral Presentation).

Ultrafast carrier dynamics near A, B, and C excitons in monolayer MoS₂ under high excitation densities: a comparative study

Presented at: APS Joint March Meeting and April Meeting, Anaheim, CA, USA, March 16–21, 2025, March 16, 2025

We presented a comparative study of ultrafast carrier dynamics near A, B, and C excitons in monolayer MoS₂ under high excitation densities, revealing distinct transient behaviors driven by many-body effects.

Recommended citation: Khatua, D. P., Gurung, S., Singh, A., and Jayabalan, J. (2025). "Ultrafast carrier dynamics near A, B, and C excitons in monolayer MoS₂ under high excitation densities: a comparative study." APS Joint March Meeting and April Meeting, Anaheim, CA, USA, March 16–21, 2025 (Poster Presentation).

Ultrafast carrier dynamics at carrier densities above Mott density: monolayer vs multilayer MoS₂

Presented at: APS March Meeting, Minneapolis, USA, March 3–8, 2024, March 03, 2024

We presented a comparative study of ultrafast carrier dynamics in monolayer and multilayer MoS₂ at excitation densities above the Mott threshold, highlighting differences in exciton dissociation and many-body effects.

Recommended citation: Khatua, D. P., Singh, A., Gurung, S., and Jayabalan, J. (2024). "Ultrafast carrier dynamics at carrier densities above Mott density: monolayer vs multilayer MoS₂." APS March Meeting, Minneapolis, USA, March 3–8, 2024 (Poster Presentation).

Nanosecond light–matter interaction with structured targets in the ablation regime

Presented at: APS March Meeting, Minneapolis, USA, March 3–8, 2024, March 03, 2024

We presented our study on nanosecond laser–matter interactions with structured targets in the ablation regime, providing insights into material response and energy deposition dynamics.

Recommended citation: Shafirin, P.^†, Khatua, D. P., and Davoyan, A. (2024). "Nanosecond light–matter interaction with structured targets in the ablation regime." APS March Meeting, Minneapolis, USA, March 3–8, 2024. [^†Presenting Author]

Plasmon-driven high-energy light–matter interaction

Presented at: APS March Meeting, Minneapolis, USA, March 3–8, 2024, March 03, 2024

We presented our study on plasmon-driven high-energy light–matter interactions, highlighting novel pathways for coupling ultrafast plasmon dynamics with extreme laser fields.

Recommended citation: Khatua, D. P., Shafirin, P., and Davoyan, A. (2024). "Plasmon-driven high-energy light–matter interaction." APS March Meeting, Minneapolis, USA, March 3–8, 2024 (Oral Presentation).

Nanophotonic control of high-energy light–materials interaction

Presented at: CLEO: Applications and Technology 2023, San Jose, CA, USA, May 7–12, 2023, May 07, 2023

We presented our work on nanophotonic control of high-energy light–material interactions, demonstrating pathways to tailor energy deposition and ultrafast dynamics.

Recommended citation: Shafirin, P.^†, Khatua, D. P., Feng, P., and Davoyan, A. (2023). "Nanophotonic control of high-energy light–materials interaction." CLEO: Applications and Technology 2023, San Jose, CA, USA, May 7–12, 2023. [^†Presenting Author]

Ultrafast photoexcited carrier dynamics of monolayer MoS₂ near the band edge above Mott density

Presented at: 37th M.P. Young Scientist Congress, Indore, India, March 14–17, 2022 (Oral Presentation), March 14, 2022

We presented our study on ultrafast carrier dynamics in monolayer MoS₂ near the band edge under excitation densities above the Mott threshold.

Micro-photoluminescence studies on MoS₂ monolayers using CW and femtosecond lasers

Presented at: 30th DAE–BRNS National Laser Symposium, Bhabha Atomic Research Centre, Mumbai, India, January 19–22, 2022, January 19, 2022

We presented our study on micro-photoluminescence of two-dimensional MoS₂ monolayers using both continuous-wave and femtosecond laser excitation.

Recommended citation: Khan, S.^†, Khatua, D. P., Khan, S., and Sharma, T. K. (2022). "Micro-photoluminescence studies on MoS₂ monolayers using CW and femtosecond lasers." 30th DAE–BRNS National Laser Symposium, Bhabha Atomic Research Centre, Mumbai, India, January 19–22, 2022. [^†Presenting Author]

A comparison of the transient optical response of a monolayer MoS₂ near its A, B, and C excitons

Presented at: 65th DAE Solid State Physics Symposium, Bhabha Atomic Research Centre, Mumbai, India, December 15–19, 2021, December 15, 2021

We presented a study comparing the transient optical response of monolayer MoS₂ near its A, B, and C excitons, recognized with the Best Poster Award.

Ultrafast carrier dynamics in a single MoS₂ monolayer flake at high excitation densities

Presented at: 7th Theme Meeting on Ultrafast Science, UM–DAE Centre for Excellence in Basic Sciences, Mumbai, India, November 12–14, 2021, November 12, 2021

We presented our study on ultrafast carrier dynamics in a single MoS₂ monolayer flake at high excitation densities.

Recommended citation: Khatua, D. P., Gurung, S., Singh, A., Khan, S., and Jayabalan, J. (2021). "Ultrafast carrier dynamics in a single MoS₂ monolayer flake at high excitation densities." 7th Theme Meeting on Ultrafast Science, UM–DAE Centre for Excellence in Basic Sciences, Mumbai, India, November 12–14, 2021 (Poster Presentation).

Carrier dynamics measurement on MoS₂ monolayers using ultrafast pump–probe spectroscopy

Presented at: Ultrafast Sciences, IIT Bombay, India, November 7–9, 2019, November 07, 2019

We presented our work on carrier dynamics in MoS₂ monolayers using ultrafast pump–probe spectroscopy, providing insights into exciton behavior at femtosecond timescales.

Recommended citation: Khatua, D. P., Gurung, S., Singh, A., Khan, S., and Jayabalan, J. (2019). "Carrier dynamics measurement on MoS₂ monolayers using ultrafast pump–probe spectroscopy." Ultrafast Sciences, IIT Bombay, India, November 7–9, 2019 (Poster Presentation).

Thesis

Khatua, D. P. (2022). Ultrafast Photoexcited Carrier Dynamics in Two-Dimensional Molybdenum Disulfide.
Ph.D. thesis, Homi Bhabha National Institute (HBNI), Raja Ramanna Centre for Advanced Technology (RRCAT), India.
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Recommended Citation:
Khatua, D. P. (2022). Ultrafast Photoexcited Carrier Dynamics in Two-Dimensional Molybdenum Disulfide. Ph.D. Thesis, HBNI–RRCAT, India. Available at: http://www.hbni.ac.in/phdthesis/phys/PHYS03201704013.pdf

“There's Plenty of Room at the Bottom”
— Sir Richard Feynman

Durga Prasad Khatua, Ph.D.

Publications

Journal Articles

Conference Proceedings

Conference Presentation & Contributions

Thesis