Ultra strong coupling regime and plasmon-polaritons in parabolic semiconductor quantum wells

TL;DR

This paper demonstrates ultra-strong coupling and plasmon-polaritons in parabolic semiconductor quantum wells, revealing significant Rabi frequency ratios and polariton gaps, highlighting their potential for exploring ultra-strong light-matter interactions.

Contribution

It introduces the use of modulation-doped parabolic quantum wells to achieve ultra-strong coupling with large Rabi ratios and polariton gaps, advancing the understanding of light-matter interactions in such systems.

Findings

Rabi frequency to resonance ratio of 27% observed

Polariton gap of approximately 670 GHz measured

Parabolic quantum wells are effective for ultra-strong coupling studies

Abstract

Ultra strong 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 2? ? 670GHz are observed, suggesting parabolic quantum wells as the system of choice in order to explore the ultra-strong coupling regime.