Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

Van Tuan, Dinh; Scharf, Benedikt; Žutić, Igor; Dery, Hanan

doi:10.1103/PhysRevX.7.041040

Title: Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

Journal Article · Fri Nov 17 00:00:00 EST 2017 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.7.041040· OSTI ID:1409241

Van Tuan, Dinh; Scharf, Benedikt; Žutić, Igor; Dery, Hanan

Just as photons are the quanta of light, plasmons are the quanta of orchestrated charge-density oscillations in conducting media. Plasmon phenomena in normal metals, superconductors, and doped semiconductors are often driven by long-wavelength Coulomb interactions. Yet, in crystals whose Fermi surface is comprised of disconnected pockets in the Brillouin zone, collective electron excitations can also attain a shortwave component when electrons transition between these pockets. Here, we show that the band structure of monolayer transition-metal dichalcogenides gives rise to an intriguing mechanism through which shortwave plasmons are paired up with excitons. The coupling elucidates the origin for the optical sideband that is observed repeatedly in monolayers of WSe₂ and WS₂ but not understood. The theory makes it clear why exciton-plasmon coupling has the right conditions to manifest itself distinctly only in the optical spectra of electron-doped tungsten-based monolayers.

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Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States); Univ. of Rochester, NY (United States)

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

Grant/Contract Number:: SC0014349; SC0004890

OSTI ID:: 1409241

Alternate ID(s):: OSTI ID: 1545802

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 7 Journal Issue: 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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