Ultrafast nonlinear carrier dynamics in graphene monolayer driven by intense terahertz pulse

Hee Jun Shin; Seong Chu Lim

doi:10.1117/12.2650023

13 March 2023 Ultrafast nonlinear carrier dynamics in graphene monolayer driven by intense terahertz pulse

Hee Jun Shin, Seong Chu Lim

Author Affiliations +

Proceedings Volume 12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI; 124200E (2023) https://doi.org/10.1117/12.2650023
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We study that carriers in monolayer graphene can be accelerated to the Fermi velocity driven by high-power terahertz pulse E_THz without lattice heating at the charge-neutrality point. It is because that electron-phonon scattering rate is strongly suppressed due to the decreasing density of state near the Dirac point. Therefore, the carriers can be accelerated without energy transfer to optical phonons. As a result, carriers in graphene can travel at the Fermi velocity. At the Fermi lever larger than 110 meV, in contrast, excited carriers by E_THz heated the lattice of graphene and optical phonons are generated. The emitted optical phonons increase carrier-carrier scattering rate and drift velocity or carrier mobility can be reduced. This study indicates that the electron-optical phonon rate is affected by Fermi level in the graphene and provides insight for high-speed electronics of graphene-based applications.

Conference Presentation

Citation Download Citation

Hee Jun Shin and Seong Chu Lim "Ultrafast nonlinear carrier dynamics in graphene monolayer driven by intense terahertz pulse", Proc. SPIE 12420, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI, 124200E (13 March 2023); https://doi.org/10.1117/12.2650023

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