Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot

Details Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot

2008-01-17

arxiv.org/abs/0801.2699v2

Phys. Rev. Lett 101, 056602 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.056602

We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection was achieved with quantum point contacts tuned to have spin-selective transport, with four contacts per dot for realizing a non-local spin-valve circuit. This provides an interesting system for studies of spintronic effects since the contacts to reservoirs can be controlled and characterized with high accuracy. We show how this can be used to extract in a single measurement the relaxation time for electron spins inside the dot ~ 300 ps and the degree of spin polarization of the contacts P ~ 0.8.

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