Long-Lived Hole Spin/Valley Polarization Probed by Kerr Rotation in Monolayer WSe2.
basic_science · Level V
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- Record sourced from PubMed, PMID 27466727.
- Also identified by DOI 10.1021/acs.nanolett.6b01727.
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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.