Excitonic Interactions and Mechanism for Ultrafast Interlayer Photoexcited Response in van der Waals Heterostructures

被引：4
|
作者：
Hu, Chen [1 ,2 ]
Naik, Mit H. [1 ,2 ]
Chan, Yang-Hao [1 ,2 ,3 ,4 ]
Louie, Steven G. [1 ,2 ]
机构：
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
[3] Acad Sinica, Inst Atom & Mol Sci, Taipei 10617, Taiwan
[4] Natl Ctr Theoret Sci, Taipei 10617, Taiwan
来源：
PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 23期
基金：
美国国家科学基金会;
关键词：
ELECTRON-HOLE EXCITATIONS; CHARGE-TRANSFER; OPTICAL-PROPERTIES; QUASI-PARTICLE; SEMICONDUCTORS; SEPARATION; SPECTRA;
D O I：
10.1103/PhysRevLett.131.236904
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Optical dynamics in van der Waals heterobilayers is of fundamental scientific and practical interest. Based on a time-dependent adiabatic GW approach, we discover a new many-electron (excitonic) channel for converting photoexcited intralayer to interlayer excitations and the associated ultrafast optical responses in heterobilayers, which is conceptually different from the conventional single-particle picture. We find strong electron-hole interactions drive the dynamics and enhance the pump-probe optical responses by an order of magnitude with a rise time of similar to 300 fs in MoSe2/WSe2 heterobilayers, in agreement with experiment.
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页数：7
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