Detection and amplification of spin noise using scattered laser light in a quantum-dot microcavity

TL;DR

This study investigates how spin noise signals are formed and amplified in a quantum-dot microcavity by analyzing scattered light, revealing key electron spin properties and effects of cavity enhancement.

Contribution

It introduces a method to detect and amplify spin noise signals in a quantum-dot microcavity using scattered light, providing new insights into spin dynamics and cavity effects.

Findings

Measured electron g-factor and spin dephasing time from scattered light

Demonstrated signal amplification via resonant excitation

Analyzed the influence of microcavity on scattering distribution

Abstract

Fundamental properties of the spin-noise signal formation in a quantum-dot microcavity are studied by measuring the angular characteristics of the scattered light intensity. A distributed Bragg reflector microcavity was used to enhance the light-matter interaction with an ensemble of n-doped (In,Ga)As/GaAs quantum dots, which allowed us to study subtle effects of the noise signal formation. Detecting the scattered light outside of the aperture of the transmitted light, we measured the basic electron spin properties, like g-factor and spin dephasing time. Further, we investigated the influence of the microcavity on the scattering distribution and possibilities of signal amplification by additional resonant excitation.