Indirect spin dephasing via charge state decoherence in optical control schemes in quantum dots

TL;DR

This paper reveals an indirect dephasing mechanism for spins in quantum dots caused by charge state decoherence during optical control, highlighting a new decoherence channel without direct spin-environment interaction.

Contribution

It introduces a generic three-component model for indirect spin dephasing and analyzes charge-phonon interactions with non-Markovian effects in quantum dot spin manipulation.

Findings

Identifies an indirect decoherence pathway for optically controlled spins.

Develops a microscopic model including charge-phonon non-Markovian interactions.

Provides insights into decoherence mechanisms affecting quantum dot spin control.

Abstract

We demonstrate that an optically driven spin of a carrier in a quantum dot undergoes indirect dephasing via conditional optically induced charge evolution even in the absence of any direct interaction between the spin and its environment. A generic model for the indirect dephasing with a three-component system with spin, charge, and reservoir is proposed. This indirect decoherence channel is studied for the optical spin manipulation in a quantum dot with a microscopic description of the charge-phonon interaction taking into account its non-Markovian nature.