Spatially-resolved Measurements of Spin Valley Polarization in Monolayer WSe<sub>2</sub>
ORAL
Abstract
Time-resolved Kerr microscopy is used to generate and measure spin valley polarizations in MOCVD-grown monolayer tungsten diselenide (WSe2). The Kerr signal reveals bi-exponential decay with fit time constants of ~100 ps and ~3 ns. Measurements are performed on several triangular flakes from the same growth cycle and reveal larger spin valley polarization near the edges of the flakes. This spatial dependence is consistent across different WSe2 flakes, but no correlation is found with spatially resolved reflectivity or photoluminescence microscopy data. Time-resolved pump-probe overlap measurements further reveal that the Kerr signal’s spatial dependence is not due to spin diffusion on the same timescale.
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Presenters
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Spencer Batalden
Applied Physics Program, University of Michigan
Authors
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Spencer Batalden
Applied Physics Program, University of Michigan
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Fauzia Mujid
Department of Chemistry, University of Chicago, Department of Chemistry and James Franck Institute, University of Chicago
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Jiwoong Park
Department of Chemistry, University of Chicago, University of Chicago, Pritzker School of Molecular Engineering, University of Chicago
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Vanessa A Sih
University of Michigan, Department of Physics, University of Michigan