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

Xinlin Song; Saien Xie; Kibum Kang; Jiwoong Park; Vanessa Sih

doi:10.1021/acs.nanolett.6b01727

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

Xinlin Song, Saien Xie, Kibum Kang, Jiwoong Park, Vanessa Sih

Research output: Contribution to journal › Article › peer-review

84 Scopus citations

Abstract

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 (∼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.

Original language	English (US)
Pages (from-to)	5010-5014
Number of pages	5
Journal	Nano Letters
Volume	16
Issue number	8
DOIs	https://doi.org/10.1021/acs.nanolett.6b01727
State	Published - Aug 10 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Mechanical Engineering
Bioengineering
General Materials Science

Keywords

Kerr rotation
Tungsten diselenide
exciton
photoluminescence
spin polarization

Access to Document

10.1021/acs.nanolett.6b01727

Cite this

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title = "Long-Lived Hole Spin/Valley Polarization Probed by Kerr Rotation in Monolayer WSe2",

abstract = "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 (∼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.",

keywords = "Kerr rotation, Tungsten diselenide, exciton, photoluminescence, spin polarization",

author = "Xinlin Song and Saien Xie and Kibum Kang and Jiwoong Park and Vanessa Sih",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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doi = "10.1021/acs.nanolett.6b01727",

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T1 - Long-Lived Hole Spin/Valley Polarization Probed by Kerr Rotation in Monolayer WSe2

AU - Song, Xinlin

AU - Xie, Saien

AU - Kang, Kibum

AU - Park, Jiwoong

AU - Sih, Vanessa

PY - 2016/8/10

Y1 - 2016/8/10

N2 - 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 (∼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.

AB - 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 (∼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.

KW - Kerr rotation

KW - Tungsten diselenide

KW - exciton

KW - photoluminescence

KW - spin polarization

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JO - Nano Letters

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