Ultrafast Dynamics of Spin Generation and Relaxation in Layered WSe2

被引：16

作者：

Ye, Jialiang ^{[1
,2
]}

Li, Ying ^{[1
,2
]}

Yan, Tengfei ^{[1
]}

Zhai, Guihao ^{[1
,2
]}

Zhang, Xinhui ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 11期

基金：

中国国家自然科学基金;

关键词：

VALLEY POLARIZATION; CARRIER DYNAMICS; MONO LAYER; MONOLAYER; COHERENCE;

D O I：

10.1021/acs.jpclett.9b01068

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigated the build-up and relaxation processes of spin-polarized A-and B-exciton dynamics in monolayer, bilayer, and bulk WSe2 using helicity-resolved two-color pump-probe spectroscopy. Substantial spin polarization was confirmed in bulk crystals, though the spin polarization degree of A excitons decreased from monolayer to bulk. However, the spin polarization of A excitons almost vanished in all different layered-flakes when resonantly pumping the B-exciton transition, owing to the dominant role of interexciton transfer. When resonantly pumping the A-exciton transition, the spin polarization of the up-converted B excitons was inverted in all layers because of the efficient Dexter-like coupling and phonon-assisted scattering. The same short spin relaxation time (1.8 +/- 0.2 ps) of A excitons was found for all studied flakes in the subsequent spin depolarization processes, which was ascribed to the active electron-phonon scattering resulting from the intrinsic small conduction-band spin-orbit coupling splitting in layered WSe2.

引用

页码：2963 / 2970

页数：15

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