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Polariton hyperspectral imaging of two-dimensional semiconductor crystals

Gebhardt, Christian; Förg, Michael; Yamaguchi, Hisato; Bilgin, Ismail; Mohite, Aditya D.; Gies, Christopher; Florian, Matthias; Hartmann, Malte; Hänsch, Theodor W.; Högele, Alexander; Hunger, David

Abstract (englisch):
Atomically thin crystals of transition metal dichalcogenides (TMDs) host excitons with strong binding energies and sizable light-matter interactions. Coupled to optical cavities, monolayer TMDs routinely reach the regime of strong light-matter coupling, where excitons and photons admix coherently to form polaritons up to room temperature. Here, we explore the two-dimensional nature of TMD polaritons with scanning-cavity hyperspectral imaging. We record a spatial map of polariton properties of extended WS2 monolayers coupled to a tunable micro cavity in the strong coupling regime, and correlate it with maps of exciton extinction and fluorescence taken from the same flake with the cavity. We find a high level of homogeneity, and show that polariton splitting variations are correlated with intrinsic exciton properties such as oscillator strength and linewidth. Moreover, we observe a deviation from thermal equilibrium in the resonant polariton population, which we ascribe to non-Markovian polariton-phonon coupling. Our measurements reveal a promisingly consistent polariton landscape, and highlight the importance of phonons for future polaritonic devices.

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Verlagsausgabe §
DOI: 10.5445/IR/1000098461
Veröffentlicht am 25.09.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2019
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000098461
Erschienen in Scientific reports
Band 9
Heft 1
Seiten Article: 13756
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 24.09.2019
Schlagwörter Transition metal dichalcogenides, polaritons, tunable microcavities
Nachgewiesen in Web of Science
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