CUED Publications database

Gate-Controlled Spin-Valley Locking of Resident Carriers in WSe2 Monolayers

Dey, P and Yang, L and Robert, C and Wang, G and Urbaszek, B and Marie, X and Crooker, SA (2017) Gate-Controlled Spin-Valley Locking of Resident Carriers in WSe2 Monolayers. Physical Review Letters, 119. ISSN 0031-9007

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Using time-resolved Kerr rotation, we measure the spin-valley dynamics of resident electrons and holes in single charge-tunable monolayers of the archetypal transition-metal dichalcogenide (TMD) semiconductor WSe2. In the n-type regime, we observe long (∼130 ns) polarization relaxation of electrons that is sensitive to in-plane magnetic fields By, indicating spin relaxation. In marked contrast, extraordinarily long (∼2 μs) polarization relaxation of holes is revealed in the p-type regime, which is unaffected by By, directly confirming long-standing expectations of strong spin-valley locking of holes in the valence band of monolayer TMDs. Supported by continuous-wave Kerr spectroscopy and Hanle measurements, these studies provide a unified picture of carrier polarization dynamics in monolayer TMDs, which can guide design principles for future valleytronic devices.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 12 May 2018 20:07
Last Modified: 11 Apr 2021 20:46
DOI: 10.1103/PhysRevLett.119.137401