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

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We propose a method based on optically detected magnetic resonance (ODMR) to measure the decoherence time T₂ 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.