Spin Relaxation in a Quantum Dot due to Nyquist Noise

Details Spin Relaxation in a Quantum Dot due to Nyquist Noise Spin Relaxation in a Quantum Dot due to Nyquist Noise

2004-04-30

arxiv.org/abs/cond-mat/0404749v2

Phys. Rev. B 71, 165325 (2005

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

v2: New discussion of arbitrary gate setups (1 new figure), more Comments on experiments; 6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.165325

We calculate electron and nuclear spin relaxation rates in a quantum dot due to the combined action of Nyquist noise and electron-nuclei hyperfine or spin-orbit interactions. The relaxation rate is linear in the resistance of the gate circuit and, in the case of spin-orbit interaction, it depends essentially on the orientations of both the static magnetic field and the fluctuating electric field, as well as on the ratio between Rashba and Dresselhaus interaction constants. We provide numerical estimates of the relaxation rate for typical system parameters, compare our results with other, previously discussed mechanisms, and show that the Nyquist mechanism can have an appreciable effect for experimentally relevant systems.

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