Optical Detection of Single-Electron Spin Decoherence in a Quantum Dot

TL;DR

This paper introduces an optical method using ODMR to measure the decoherence time of a single electron spin in a quantum dot, leveraging ESR and Pauli blocking to detect spin states through photoluminescence modulation.

Contribution

It presents a novel optical technique for measuring electron spin decoherence in quantum dots, combining ESR with optical detection for high sensitivity.

Findings

Proposes a feasible ODMR setup for quantum dots.

Demonstrates modulation of photoluminescence due to ESR.

Analyzes different schemes for implementation.

Abstract

We propose a method based on optically detected magnetic resonance (ODMR) to measure the decoherence time $T_{2}$ of a single electron spin in a semiconductor quantum dot. The electron spin resonance (ESR) of a single excess electron on a quantum dot is probed by circularly polarized laser excitation. Due to Pauli blocking, optical excitation is only possible for one of the electron-spin states. The photoluminescence is modulated due to the ESR which enables the measurement of electron spin decoherence. We study different possible schemes for such an ODMR setup.