Control of non-Markovian effects in the dynamics of polaritons in semiconductor microcavities

TL;DR

This paper demonstrates how optically controllable memory effects in polariton systems within semiconductor microcavities can be turned on and off, revealing non-Markovian dynamics influenced by excitation strength and detuning.

Contribution

It provides a comprehensive analytical and numerical analysis of non-Markovian effects in polariton dynamics, linking experimental observations with theoretical modeling.

Findings

Revival of photoluminescence signals indicating non-Markovian behavior

Memory effects depend on negative detuning and strong excitation

Confirmation of reservoir coupling as the origin of observed effects

Abstract

We report on time-resolved photoluminescence from semiconductor microcavities showing that an optically controllable mechanism exists to turn on and off memory effects in a polariton system. By increasing the laser pumping pulse intensity we observe revivals of the decaying time-resolved photoluminescence signal, a manifestly non-Markovian behavior of the optically active polaritons. Based on an open quantum system approach we perform a comprehensive analytical and numerical study of the coupling of optically active polaritons to a structured reservoir to confirm the origin of the observed features. Our findings show that negative detunings and strong excitation should occur simultaneously for memory effects to take place.