Theory of optical spin control in quantum dot microcavities

TL;DR

This paper develops a microscopic theory for optical spin control in quantum dot microcavities, showing efficient spin orientation and large Kerr/Faraday rotation angles achievable with specific optical pulses.

Contribution

It introduces a detailed microscopic model for spin manipulation in quantum dot microcavities, addressing strong coupling and optical control techniques.

Findings

Efficient spin orientation achievable with a single circularly polarized pulse.

Kerr and Faraday rotation angles can reach tens of degrees.

Spin control effective in weak transverse magnetic fields.

Abstract

We present a microscopic theory of optical initialization, control and detection for a single electron spin in a quantum dot embedded into a zero-dimensional microcavity. The strong coupling regime of the trion and the cavity mode is addressed. We demonstrate that efficient spin orientation by a single circularly polarized pulse is possible in relatively weak transverse magnetic fields. The possibilities for spin control by additional circularly polarized pulse are analyzed. Under optimal conditions the Kerr and Faraday rotation angles induced by the spin polarized electron may reach tens of degrees.