Kinetics of Spin Relaxation in Wires and Channels: Boundary Spin Echo and Tachyons

TL;DR

This paper develops a comprehensive spin kinetic model applicable to 1D and 2D systems, revealing boundary effects, oscillations, and analogies to relativistic equations, advancing understanding of spin relaxation dynamics in nanostructures.

Contribution

It introduces a general spin kinetic equation approach that captures boundary effects, oscillations, and relativistic analogies, extending beyond traditional diffusion models.

Findings

Exponential spin relaxation in infinite wires can be modulated by oscillations.

Homogeneous spin polarization can evolve into a persistent spin helix.

Spin relaxation in 2D channels mirrors that in finite 1D wires.

Abstract

In this paper we use a spin kinetic equation to study spin polarization dynamics in 1D wires and 2D channels. This approach is valid in both diffusive and ballistic spin transport regimes and, therefore, more general than the usual spin drift-diffusion equations. In particular, we demonstrate that in infinite 1D wires with Rashba spin-orbit interaction the exponential spin relaxation decay can be modulated by an oscillating function. In the case of spin relaxation in finite length 1D wires, it is shown that an initially homogeneous spin polarization spontaneously transforms into a persistent spin helix. An interesting sound waves echo-like behavior of initially localized spin polarization packet is found in finite length wires. We show that a propagating spin polarization profile reflects from a system boundary and returns back to its initial position similarly to the reflectance of sound waves from an obstacle. Green's function of spin kinetic equation is found for both finite and infinite 1D systems. Moreover, we demonstrate explicitly that the spin relaxation in 2D channels with Rashba and Dresselhaus spin-orbit interactions of equal strength occurs similarly to that in 1D wires of finite length. Finally, a simple transformation mapping 1D spin kinetic equation into the Klein-Gordon equation with an imaginary mass is found thus establishing an interesting connection between semiconductor spintronics and relativistic quantum mechanics.