Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- State Univ. of New York (SUNY), Albany, NY (United States); Univ. of Rochester, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1409241
- Alternate Identifier(s):
- OSTI ID: 1545802
- Grant/Contract Number:
- SC0014349; SC0004890
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. X
- Additional Journal Information:
- Journal Name: Physical Review. X Journal Volume: 7 Journal Issue: 4; Journal ID: ISSN 2160-3308
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Van Tuan, Dinh, Scharf, Benedikt, Žutić, Igor, and Dery, Hanan. Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides. United States: N. p., 2017.
Web. doi:10.1103/PhysRevX.7.041040.
Van Tuan, Dinh, Scharf, Benedikt, Žutić, Igor, & Dery, Hanan. Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides. United States. https://doi.org/10.1103/PhysRevX.7.041040
Van Tuan, Dinh, Scharf, Benedikt, Žutić, Igor, and Dery, Hanan. Fri .
"Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides". United States. https://doi.org/10.1103/PhysRevX.7.041040.
@article{osti_1409241,
title = {Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides},
author = {Van Tuan, Dinh and Scharf, Benedikt and Žutić, Igor and Dery, Hanan},
abstractNote = {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.},
doi = {10.1103/PhysRevX.7.041040},
journal = {Physical Review. X},
number = 4,
volume = 7,
place = {United States},
year = {Fri Nov 17 00:00:00 EST 2017},
month = {Fri Nov 17 00:00:00 EST 2017}
}
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https://doi.org/10.1103/PhysRevX.7.041040
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