Mesoscopic spin confinement during acoustically induced transport

TL;DR

This paper demonstrates that mesoscopic spin confinement during acoustically induced electron transport leads to long coherence lifetimes, governed by the spin-orbit length and independent of local carrier densities, with coherence controllable via sample dimensions.

Contribution

It reveals how spin coherence is maintained through mesoscopic confinement and how it can be tuned by sample geometry, advancing spin transport control.

Findings

Coherence lifetime is independent of local carrier density.

Spin precession frequency can be modified by sample dimensions.

Spin-orbit length determines the confinement and coherence properties.

Abstract

Long coherence lifetimes of electron spins transported using moving potential dots are shown to result from the mesoscopic confinement of the spin vector. The confinement dimensions required for spin control are governed by the characteristic spin-orbit length of the electron spins, which must be larger than the dimensions of the dot potential. We show that the coherence lifetime of the electron spins is independent of the local carrier densities within each potential dot and that the precession frequency, which is determined by the Dresselhaus contribution to the spin-orbit coupling, can be modified by varying the sample dimensions resulting in predictable changes in the spin-orbit length and, consequently, in the spin coherence lifetime.