Proposed Rabi-Kondo Correlated State in a Laser-Driven Semiconductor Quantum Dot

TL;DR

This paper investigates a novel nonequilibrium quantum state in a laser-driven quantum dot, revealing how strong exchange and laser coupling create a secondary spin screening cloud, with implications for emission spectra.

Contribution

It introduces the Rabi-Kondo correlated state, a new quantum state arising from the interplay of exchange interactions and laser driving in quantum dots.

Findings

Identification of a laser-induced secondary spin screening cloud

Analysis of emission spectrum modifications due to the correlated state

Demonstration of a new nonequilibrium quantum-correlated state

Abstract

Spin exchange between a single-electron charged quantum dot and itinerant electrons leads to an emergence of Kondo correlations. When the quantum dot is driven resonantly by weak laser light, the resulting emission spectrum allows for a direct probe of these correlations. In the opposite limit of vanishing exchange interaction and strong laser drive, the quantum dot exhibits coherent oscillations between the single-spin and optically excited states. Here, we show that the interplay between strong exchange and non-perturbative laser coupling leads to the formation of a new nonequilibrium quantum-correlated state, characterized by the emergence of a laser-induced secondary spin screening cloud, and examine the implications for the emission spectrum.