Long-Lived Spin Coherence States

TL;DR

This paper investigates how initial spin polarization distribution affects electron spin relaxation times in semiconductor heterostructures, revealing a novel long-lived spin coherence state called a spin coherence standing wave.

Contribution

It introduces the concept of a spin coherence standing wave and predicts its long spin relaxation time, offering new insights into spin dynamics in semiconductors.

Findings

Spin relaxation time depends on initial spin polarization distribution.

Coherent spin precession influences relaxation in diffusing electrons.

Proposes experimental realization of long-lived spin coherence states.

Abstract

We study evolution of electron spin coherence having non-homogeneous direction of spin polarization vector in semiconductor heterostructures. It is found that the electron spin relaxation time due to the D'yakonov-Perel' relaxation mechanism essentially depends on the initial spin polarization distribution. This effect has its origin in the coherent spin precession of electrons diffusing in the same direction. We predict a long spin relaxation time of a novel structure: a spin coherence standing wave and discuss its experimental realization.