Journal
2D MATERIALS
Volume 5, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa98ae
Keywords
transition metal dichalcogenides; spin Ironies; valleytronics; Kerr rotation
Categories
Funding
- NSF [DMR-1310661]
- NSF MRSEC [DMR-1420451]
- C-SPIN STARnet, a Semiconductor Research Corporation program
- MARCO
- DARPA
- core programs at NRL
- NRL Nanoscience Institute
- AFOSR [F4GGA24233G001]
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Monolayer transition metal dichalcogenides (TMD) have immense potential for future spintronic and valleytronic applications due to their 2D nature and long spin/valley lifetimes. We investigate the origin of these long-lived states in n-type WS2 using time-resolved Kerr rotation microscopy and photoluminescence microscopy with similar to 1 mu m spatial resolution. Comparing the spatial dependence of the Kerr rotation signal and the photoluminescence reveals a correlation with neutral exciton emission, which is likely due to the transfer of angular momentum to resident conduction electrons with long spin/valley lifetimes. In addition, we observe an unexpected anticorrelation between the Kerr rotation and trion emission, which provides evidence for the presence of long-lived spin/valley-polarized dark trions. We also find that the spin/valley polarization in WS2 is robust to magnetic fields up to 700 mT, indicative of spins and valleys that are stabilized with strong spin-orbit fields.
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