Datta-Das type spin-field effect transistor in non-ballistic regime

TL;DR

This paper demonstrates that a Datta-Das spin-field effect transistor can operate effectively in non-ballistic regimes within (001) quantum well systems due to suppressed spin relaxation from Rashba and Dresselhaus interactions.

Contribution

It reveals that spin helix states enable the application of Datta-Das transistors in realistic non-ballistic 2D electron systems, challenging previous assumptions.

Findings

Strong suppression of D'yakonov-Perel' spin relaxation in spin helix states.

Applicability of Datta-Das transistor in non-ballistic regimes.

Enhanced spin coherence in (001) quantum wells.

Abstract

It is revealed that in spin helix state of (001) quantum well system, strong suppression of D'yakonov-Perel' spin relaxation process occurs by an interplay between Rashba and Dresselhaus couplings over a wide range of Rashba coupling strength. Contrary to common belief in early works, this leads to the finding that Datta-Das type spin-field effect transistor is actually applicable to more realistic non-ballistic transport regime in two dimensional electron gas system.