Valley and spin dynamics in MoSe2 two-dimensional crystals

被引：70

作者：

Kumar, Nardeep ^{[1
]}

He, Jiaqi ^{[2
]}

He, Dawei ^{[2
]}

Wang, Yongsheng ^{[2
]}

Zhao, Hui ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[2] Beijing Jiaotong Univ, Key Lab Luminescence & Opt Informat, Minist Educ, Inst Optoelect Technol, Beijing 100044, Peoples R China

来源：

NANOSCALE | 2014年 / 6卷 / 21期

基金：

美国国家科学基金会;

关键词：

MONOLAYER MOS2; TRANSITION; PHOTOLUMINESCENCE; PHOTOTRANSISTORS; SEMICONDUCTORS; POLARIZATION; SPINTRONICS; ELECTRONICS; GENERATION; TRANSPORT;

D O I：

10.1039/c4nr03607g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We study valley and spin dynamics in monolayer molybdenum diselenide by polarization-resolved femto-second transient absorption spectroscopy. Valley-and spin-polarized excitons are injected by a circularly polarized laser pulse, with an excess energy of 120 meV. Relaxation of the valley polarization is time-resolved by measuring dynamical circular dichroism of a linearly polarized probe pulse tuned to 790 nm, the peak of the exciton resonance of monolayer MoSe2. We obtain a valley relaxation time of 9 +/- 3 ps at room temperature, which is at least one order of magnitude shorter than the simultaneously measured exciton lifetime. The results illustrate potential applications of MoSe2 in room-temperature valleytronic and spintronic devices.

引用

页码：12690 / 12695

页数：6

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