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

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

VALLEY POLARIZATION; SPIN COHERENCE; MOS2; PHOTOLUMINESCENCE; ELECTRONS

Citation

NANO LETTERS, v.16, no.8, pp.5010 - 5014

ISSN
1530-6984
DOI
10.1021/acs.nanolett.6b01727
URI
http://hdl.handle.net/10203/238853
Appears in Collection
MS-Journal Papers(저널논문)
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