Ultrastrong coupling regime and plasmon polaritons in parabolic semiconductor quantum wells |
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Authors: | Geiser Markus Castellano Fabrizio Scalari Giacomo Beck Mattias Nevou Laurent Faist Jérôme |
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Institution: | Institute for Quantum Electronics, ETH Zurich, Wolfgang-Pauli-Strasse 16, 8093 Zurich, Switzerland. mgeiser@ethz.ch |
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Abstract: | Ultrastrong coupling is studied in a modulation-doped parabolic potential well coupled to an inductance-capacitance resonant circuit. In this system, in accordance to Kohn's theorem, strong reduction of the energy level separation caused by the electron-electron interaction compensates the depolarization shift. As a result, a very large ratio of 27% of the Rabi frequency to the center resonance frequency as well as a polariton gap of width 2π × 670 GHz are observed, suggesting parabolic quantum wells as the system of choice in order to explore the ultrastrong coupling regime. |
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