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 journalArticlepeer-review

62 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 languageEnglish (US)
Pages (from-to)5010-5014
Number of pages5
JournalNano Letters
Volume16
Issue number8
DOIs
StatePublished - Aug 10 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

Keywords

  • exciton
  • Kerr rotation
  • photoluminescence
  • spin polarization
  • Tungsten diselenide

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