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Momentum-Resolved Exciton Coupling and Valley Polarization Dynamics in Monolayer WS_{2}
Alice Kunin1, Sergey Chernov1, Jin Bakalis1
1Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA.
Abstract:
Using time- and angle-resolved photoemission, we present momentum- and energy-resolved measurements of exciton coupling in monolayer WS_{2}. We observe strong intravalley coupling between the B_{1s} exciton and A_{n>1} states. Our measurements indicate that the dominant valley depolarization mechanism conserves the exciton binding energy and momentum. While this conservation is consistent with Coulomb exchange-driven valley depolarization, we do not observe a momentum or energy dependence to the depolarization rate as would be expected for the exchange-based mechanism.
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