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) |
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Pages (from-to) | 5010-5014 |
Number of pages | 5 |
Journal | Nano Letters |
Volume | 16 |
Issue number | 8 |
DOIs | |
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