Prof. Ryan Smith Profile

Prof. Ryan Smith

at California State Univ East Bay

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Proceedings Article | 14 March 2015 Paper

Broadband transient THz conductivity of the transition-metal dichalcogenide MoS2

J. Buss, R. Smith, G. Coslovich, R. Kaindl

Proceedings Volume 9361, 93611F (2015) https://doi.org/10.1117/12.2080748

KEYWORDS: Terahertz radiation, Phonons, Reflectivity, Picosecond phenomena, Spectroscopy, Ultrafast phenomena, Ultrafast laser spectroscopy, Modulation, Systems modeling, Data modeling

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The transient dynamics of transition-metal dichalcogenides is of significant interest for clarifying fundamental manyparticle interactions at the nanoscale as well as for novel applications. We report an ultrafast terahertz study up to 7 THz of the lamellar semiconductor MoS₂ to access the non-equilibrium conductivity of photo-excited indirect e-h pairs in this multi-layered parent compound. While the equilibrium transport is Drude-like, near-IR optical excitation results in a complex photo-induced conductivity that consists of two components. Mobile charge carriers dominate the low frequency response below 2 THz, while at low temperatures an additional excess conductivity is observed that is enhanced around 4 THz. Two time scales appear in the dynamics: a slow ns relaxation due to non-radiative recombination and a faster sub-100 ps decay connected to the high-frequency THz feature. We discuss the broad THz peak within a model of intra-excitonic transitions in MoS₂. It agrees well with the expected binding energy and oscillator strength, yet results in an anomalous temperature dependence of the exciton fraction requiring an electronically inhomogeneous phase.

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