Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe 2

Batalden, Spencer; Sih, Vanessa

doi:10.1364/OE.426664

Title: Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe ₂

Journal Article · Wed May 19 00:00:00 EDT 2021 · Optics Express

DOI:https://doi.org/10.1364/OE.426664· OSTI ID:1842363

Batalden, Spencer; Sih, Vanessa

Time-resolved Kerr rotation microscopy is used to generate and measure spin valley polarization in MOCVD-grown monolayer tungsten diselenide (WSe ₂ ). The Kerr signal reveals bi-exponential decay with 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 observed across multiple WSe ₂ flakes in the Kerr rotation measurements but not in the spatially resolved reflectivity or microphotoluminescence data. Time-resolved pump-probe overlap measurements further reveal that the Kerr signal’s spatial dependence is not due to spin diffusion on the nanosecond timescale.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0016206

OSTI ID:: 1842363

Alternate ID(s):: OSTI ID: 1852123

Journal Information:: Optics Express, Journal Name: Optics Express Vol. 29 Journal Issue: 11; ISSN 1094-4087

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe ₂