Landau polaritons in highly nonparabolic two-dimensional gases in the ultrastrong coupling regime

Journal article (2020)

Authors

Janine Keller ETH Zürich
G. Scalari ETH Zürich
Giacomo Scalari ETH Zürich
Felice Appugliese ETH Zürich
S. Rajabali ETH Zürich
Shima Rajabali ETH Zürich
Mattias Beck ETH Zürich
Johannes Haase Paul Scherrer Institut
C. A. Lehner ETH Zürich
W. Wegscheider ETH Zürich
Werner Wegscheider ETH Zürich
M. Failla University of Warwick
Michele Failla University of Warwick
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Published Date

2020

Language

English

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Abstract

We probe ultrastrong light-matter coupling between metallic terahertz metasurfaces and Landau-level transitions in high-mobility two-dimensional electron and hole gases. We utilize heavy-hole cyclotron resonances in strained Ge and electron cyclotron resonances in InSb quantum wells, both within highly nonparabolic bands, and compare our results to well-known parabolic AlGaAs/GaAs quantum well systems. Tuning the coupling strength of the system by two methods, lithographically and by optical pumping, we observe a behavior clearly deviating from the standard Hopfield model previously verified in cavity quantum electrodynamics: An opening of a lower polaritonic gap.