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 GG05: V: Electrons, Phonons, Electron-Phonon Scattering and Phononics I
12:30 PM–2:42 PM,
Monday, March 20, 2023
Room: Virtual Room 5
Sponsoring
Unit:
DCOMP
Chair: Rohit Goswami, Science Institute, University of Iceland & Quansight Labs,TX
Abstract: GG05.00004 : First-principles simulations of ultrafast phase transition in condensed-matter systems*
1:30 PM–1:42 PM
Presenter:
Mengxue Guan
(Beijing Institute of Technology)
Author:
Mengxue Guan
(Beijing Institute of Technology)
Collaboration:
Mengxue Guan, Xinbao Liu, En Wang, Daqiang Chen, Sheng Meng
Here, we show strength of this method in revealing the explicit structural phase transition pathways in wide range of quantum materials. Firstly, the temporal characters of laser-driven phase transition from 2H to 1T' has been investigated in the prototype MoTe2 monolayer. This process is found to be induced by fundamental electron-phonon interactions, with an unexpected phonon excitation and coupling pathway closely related to the nonequilibrium relaxation of photoexcited electrons. The order-to-order phase transformation is dissected into three substages, involving energy and momentum scattering processes from optical to acoustic phonon modes in subpicosecond timescale. Secondly, an unexpected orbital-selective photoexcitation in type-II Weyl material WTe2 is reported under linearly polarized light (LPL), inducing striking transitions among several topologically-distinct phases mediated by effective electron-phonon couplings. The symmetry features of atomic orbitals comprising the Weyl bands result in asymmetric electronic transitions near the Weyl points, and in turn a switchable interlayer shear motion with respect to linear light polarization, when a near-infrared laser pulse is applied. Consequently, not only annihilation of Weyl quasiparticle pairs, but also increasing separation of Weyl points can be achieved, complementing existing experimental observations.The reported results address the requirements for rational manipulation of material and device performances by laser fields and hence might lead to profound implications.
*National Natural Science Foundation of China (Nos. 12025407, 91850120, 11774396, 11934003, and 11974045);National Key Research and Development Program of China (No. 2021YFA1400201);"Strategic Priority Research Program (B)" of Chinese Academy of Sciences (Grant No. XDB330301); China Postdoctoral Science Foundation (Grant No. 2021M693369)
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