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

73 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

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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 = "Funding Information: X.S. and V.S. would like to acknowledge helpful discussions with Hanan Dery. The work at the University of Michigan is supported by the Defense Threat Reduction Agency Basic Research Award No. HDTRA 1-13-1-0013 and the National Science Foundation Materials Research Science and Engineering Center program DMR-1120923. The work at the Cornell University is supported by AFOSR (FA2386-13-1-4118, FA9550-16-1-0031) and Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (2012M3A7B4049887). Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

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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

N1 - Funding Information: X.S. and V.S. would like to acknowledge helpful discussions with Hanan Dery. The work at the University of Michigan is supported by the Defense Threat Reduction Agency Basic Research Award No. HDTRA 1-13-1-0013 and the National Science Foundation Materials Research Science and Engineering Center program DMR-1120923. The work at the Cornell University is supported by AFOSR (FA2386-13-1-4118, FA9550-16-1-0031) and Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (2012M3A7B4049887). Publisher Copyright: © 2016 American Chemical Society.

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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