Single photon superradiance and cooperative Lamb shift in an optoelectronic device

TL;DR

This paper demonstrates room-temperature single photon superradiance and cooperative Lamb shift in a semiconductor device, showing enhanced emission and frequency shifts due to photon exchange among quantum wells.

Contribution

It introduces a novel optoelectronic device that observes superradiance and Lamb shift at room temperature, combining experimental and theoretical analysis.

Findings

Observation of superradiant emission at room temperature

Detection of a large cooperative Lamb shift

Interaction of plasma oscillations via photon exchange

Abstract

Single photon superradiance is a strong enhancement of spontaneous emission appearing when a single excitation is shared between a large number of two-level systems. This enhanced rate can be accompanied by a shift of the emission frequency, the cooperative Lamb shift, issued from the exchange of virtual photons between the emitters. In this work we present a semiconductor optoelectronic device allowing the observation of these two phenomena at room temperature. We demonstrate experimentally and theoretically that plasma oscillations in spatially separated quantum wells interact through real and virtual photon exchange. This gives rise to a superradiant mode displaying a large cooperative Lamb shift.