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

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• 作者：Xinlin Song ; Saien Xie ; Kibum Kang ; Jiwoong Park ; Vanessa Sih
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：16
• 期：8
• 页码：5010-5014
• 全文大小：379K
• 年卷期：0
• ISSN：1530-6992

文摘

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.