Dynamics of Spin Relaxation in Finite-Size 2D Systems: an Exact Solution

Details Dynamics of Spin Relaxation in Finite-Size 2D Systems: an Exact Solution Dynamics of Spin Relaxation in Finite-Size 2D Systems: an Exact Solution

2011-06-15

arxiv.org/abs/1106.2989v1

Phys. Rev. B 84, 075331 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.84.075331

We find an exact solution for the problem of electron spin relaxation in a 2D circle with Rashba spin-orbit interaction. Our analysis shows that the spin relaxation in finite-size regions involves three stages and is described by multiple spin relaxation times. It is important that the longest spin relaxation time increases with decrease in system radius but always remains finite. Therefore, at long times, the spin polarization in small 2D systems decays exponentially with a size-dependent rate. This prediction is supported by results of Monte Carlo simulations.

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