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Marrying excitons and plasmons in monolayer transition-metal dichalcogenides
Zitieren Sie bitte immer diese URN: urn:nbn:de:bvb:20-opus-173030
- 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. However, 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. In this work, we show that the band structure of monolayerJust 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. However, 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. In this work, 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 WSe\(_2\) and WS\(_2\) 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.…
Autor(en): | Dinh Van Tuan, Benedikt Scharf, Igor Žutič, Hanan Dery |
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URN: | urn:nbn:de:bvb:20-opus-173030 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Physik und Astronomie / Institut für Theoretische Physik und Astrophysik |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Physical Review X |
Erscheinungsjahr: | 2017 |
Band / Jahrgang: | 7 |
Heft / Ausgabe: | 4 |
Aufsatznummer: | 041040 |
Originalveröffentlichung / Quelle: | Physical Review X (2017) 7(4):041040. https://doi.org/10.1103/PhysRevX.7.041040 |
DOI: | https://doi.org/10.1103/PhysRevX.7.041040 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Freie Schlagwort(e): | excitons; physics; plasmons; semiconductors; spintronics; valleytronics |
Datum der Freischaltung: | 25.05.2021 |
Lizenz (Deutsch): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |