High room temperature optical polarization due to spin-valley coupling in monolayer WS2
Source abstract
Abstract
We prepare single-layer WS2 films such that the photoluminescence is from either the neutral exciton or the negatively charged trion. While the neutral exciton emission has zero polarization at room temperature, we observe a room temperature optical polarization in excess of 40% for the trion. Using an applied gate voltage, we can modulate the electron density, and subsequently the polarization of the trion emission continuously from 20-40%. Both the polarization and the emission energy monotonically track the gate voltage with the emission energy increasing by 45 meV. We discuss the role electron capture by the exciton has on suppressing the intervalley scattering process.
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Research context
OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Graphene research and applications
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Affiliations
Naval Research Laboratory 1 Materials Science & Technology Division, , 4555 Overlook Ave SW, Washington, DC 20375, USA
University of Crete 2 , Heraklion Crete, 71003, Greece
Foundation for Research and Technology Hellas (FORTH) 3 Institute of Electronic Structure and Laser (IESL), , Heraklion Crete, 71110, Greece
Naval Research Laboratory 4 Optical Sciences Division, , 4555 Overlook Ave SW, Washington, DC 20375, USA
Funding
Air Force Office of Scientific Research
References (28)
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