Probing Single-Electron Spin Decoherence in Quantum Dots using Charged Excitons

Details Probing Single-Electron Spin Decoherence in Quantum Dots using Charged Excitons Probing Single-Electron Spin Decoherence in Quantum Dots using Charged Excitons

2004-08-20

arxiv.org/abs/cond-mat/0408451v1

J. Supercond. 18, 175 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures. Proceedings of the PASPS3 conference, Santa Barbara, CA (USA). To appear in the Journal of Superconductivi

Scientific paper

10.1007/s10948-005-3355-x

We propose to use optical detection of magnetic resonance (ODMR) to measure the decoherence time T_{2} of a single electron spin in a semiconductor quantum dot. The electron is in one of the spin 1/2 states and a circularly polarized laser can only create an optical excitation for one of the electron spin states due to Pauli blocking. An applied electron spin resonance (ESR) field leads to Rabi spin flips and thus to a modulation of the photoluminescence or, alternatively, of the photocurrent. This allows one to measure the ESR linewidth and the coherent Rabi oscillations, from which the electron spin decoherence can be determined. We study different possible schemes for such an ODMR setup, including cw or pulsed laser excitation.

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