Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe2

被引：3

作者：

Batalden, Spencer ^{[1
]}

Sih, Vanessa ^{[2
]}

机构：

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

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

来源：

OPTICS EXPRESS | 2021年 / 29卷 / 11期

关键词：

PHOTOLUMINESCENCE; RELAXATION; DYNAMICS; MOS2;

D O I：

10.1364/OE.426664

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Time-resolved Kerr rotation microscopy is used to generate and measure spin valley polarization in MOCVD-grown monolayer tungsten diselenide (WSe2). The Kerr signal reveals bi-exponential decay with time constants of 100 ps and 3 ns. Measurements are performed on several triangular flakes from the same growth cycle and reveal larger spin valley polarization near the edges of the flakes. This spatial dependence is observed across multiple WSe2 flakes in the Kerr rotation measurements but not in the spatially resolved reflectivity or microphotoluminescence data. Time-resolved pump-probe overlap measurements further reveal that the Kerr signal's spatial dependence is not due to spin diffusion on the nanosecond timescale. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：17269 / 17276

页数：8

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