Long-Lived Hole Spin/Valley Polarization Probed by Kerr Rotation in Monolayer WSe2

被引：83

作者：

Song, Xinlin ^{[1
]}

Xie, Saien ^{[2
]}

Kang, Kibum ^{[3
]}

Park, Jiwoong ^{[3
,4
]}

Sih, Vanessa ^{[5
]}

机构：

[1] Univ Michigan, Appl Phys Program, 450 Church St, Ann Arbor, MI 48109 USA

[2] Cornell Univ, Sch Appl & Engn Phys, 245 East Ave, Ithaca, NY 14853 USA

[3] Cornell Univ, Dept Chem & Chem Biol, 245 East Ave, Ithaca, NY 14853 USA

[4] Kavli Inst Cornell Nanoscale Sci, 245 East Ave, Ithaca, NY 14853 USA

[5] Univ Michigan, Dept Phys, 450 Church St, Ann Arbor, MI 48109 USA

来源：

NANO LETTERS | 2016年 / 16卷 / 08期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

Tungsten diselenide; Kerr rotation; photoluminescence; exciton; spin polarization; VALLEY POLARIZATION; SPIN COHERENCE; MOS2; ELECTRONS;

D O I：

10.1021/acs.nanolett.6b01727

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Time-resolved Kerr rotation and photoluminescence measurements are performed on MOCVD-grown monolayer tungsten diselenide (WSe2). We observe a surprisingly long-lived Kerr rotation signal (similar to 80 ns) at 10 K, which is attributed to spin/valley polarization of the resident holes. This polarization is robust to transverse magnetic field (up to 0.3 T). Wavelength-dependent measurements reveal that only excitation near the free exciton energy generates this long-lived spin/valley polarization.

引用

页码：5010 / 5014

页数：5

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