Momentum-Resolved Exciton Coupling and Valley Polarization Dynamics in Monolayer WS2

Alice Kunin, Sergey Chernov, Jin Bakalis, Ziling Li, Shuyu Cheng, Zachary H. Withers, Michael G. White, Gerd Schönhense, Xu Du, Roland K. Kawakami, Thomas K. Allison

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Using time- and angle-resolved photoemission, we present momentum- and energy-resolved measurements of exciton coupling in monolayer WS2. We observe strong intravalley coupling between the B1s exciton and An>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.

Original languageEnglish (US)
Article number046202
JournalPhysical review letters
Volume130
Issue number4
DOIs
StatePublished - Jan 27 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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