Coherent optical control of correlation waves of spins in semiconductors

TL;DR

This paper explores how polarization squeezing correlations in light can be used to control and modulate spin fluctuations in semiconductors, revealing non-equilibrium fluctuation spectra and dynamic correlation effects.

Contribution

It introduces a method to control semiconductor spin fluctuations via optical phase modulation of squeezed light, considering higher-order effects and non-equilibrium conditions.

Findings

Spin fluctuations can be optically controlled by phase modulation.

The fluctuation spectrum becomes non-Lorentzian and phase-dependent.

Time delays and sign flips in spin correlations are demonstrated.

Abstract

We calculate the dynamical fluctuation spectrum of electronic spins in a semiconductor under a steady-state illumination by light containing polarization squeezing correlations. Taking into account quasi-particle lifetime and spin relaxation for this non-equilibrium situation we consider up to fourth order optical effects which are sensitive to the squeezing phases. We demonstrate the possibility to control the spin fluctuations by optically modulating these phases as a function of frequency, leading to a non-Lorentzian spectrum which is very different from the thermal equilibrium fluctuations in n-doped semiconductors. Specifically, in the time-domain spin-spin correlation can exhibit time delays and sign flips originating from the phase modulations and correlations of polarizations, respectively. For higher light intensity we expect a regime where the squeezing correlations will dominate the spectrum.