Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session RR04: V: Ultrafast Spectroscopy: Applications and Techniques
11:30 AM–12:54 PM,
Tuesday, March 21, 2023
Room: Virtual Room 4
Sponsoring
Unit:
DLS
Chair: Samuel Teitelbaum, Arizona State University
Abstract: RR04.00001 : Vibrational coherent control of intervalley scattering in monolayer WSe2
11:30 AM–11:42 AM
Presenter:
Chenyu Wang
(Institute of Physics, Chinese Academy of Sciences)
Author:
Chenyu Wang
(Institute of Physics, Chinese Academy of Sciences)
This talk aims at revealing the quantitative coherent-phonon-driven electronic intervalley transition upon photoexcitation in monolayer WSe2. We start with launching coherent lattice motion along the zone-boundary LA mode and show the non-equilibrium electronic configuration and electron population are strongly coupled with coherent phonon oscillation using the state-of-art time-dependent density functional theory (TDDFT). We observe a step-like electron transition from the optically bright K to dark Q state on a time scale ~ 400 fs in excellent agreement with previous experimental studies [5] and further a reversed Q-to-K transition which we refer to as coherent phonon induced Rabi oscillation. We discuss the coupled electron and lattice dynamics by constructing a two-level model and uncover the crucial role of nonadiabatic coupling effects. Finally, we propose a new strategy to effectively tune the intervalley scattering rates by varying the coherent phonon amplitude, which could be realized via nonlinear phononics that we hope to spark experimental investigations [6].
1 H. Hübener, et al., Nano Lett. 18 (2), 1535-1542 (2018)
2 S. Priyadarshi, et al., Phys. Rev. Lett. 128, 136402 (2022)
3 J. R. Schaibley, et al., Nat. Rev. Mater. 1, 16055 (2016).
4 Z. Jin, et al., Phys. Rev. B 90, 045422 (2014)
5 J. Madéo, et al., Science 370, 1199 (2020)
6 A. S. Disa, et al., Nat. Phys. 17, 1087–1092 (2021).
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