Virtual Trions in the Photoluminescence of Monolayer Transition-Metal Dichalcogenides

Tuan, Dinh Van; Jones, Aaron M.; Yang, Min; Xu, Xiaodong; Dery, Hanan

doi:10.1103/physrevlett.122.217401

Virtual Trions in the Photoluminescence of Monolayer Transition-Metal Dichalcogenides

Journal Article · Wed May 29 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.217401· OSTI ID:1612148

Tuan, Dinh Van ^[1]; Jones, Aaron M. ^[2]; Yang, Min ^[3]; Xu, Xiaodong ^[2]; Dery, Hanan ^[3]

Univ. of Rochester, NY (United States); DOE/OSTI
Univ. of Washington, Seattle, WA (United States)
Univ. of Rochester, NY (United States)

Photoluminescence experiments from monolayer transition-metal dichalcogenides often show that the binding energy of trions is conspicuously similar to the energy of optical phonons. This enigmatic coincidence calls into question whether phonons are involved in the radiative recombination process. We address this problem, unraveling an intriguing optical transition mechanism. Its initial state is a localized charge (electron or hole) and delocalized exciton. The final state is the localized charge, phonon, and photon. In between, the intermediate state of the system is a virtual trion formed when the localized charge captures the exciton through emission of the phonon. Furthermore, we analyze the difference between radiative recombinations that involve real and virtual trions (i.e., with and without a phonon), providing useful ways to distinguish between the two in experiment.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rochester, NY (United States); Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014349; SC0018171

OSTI ID:: 1612148

Alternate ID(s):: OSTI ID: 1523328

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 122; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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