D'yakonov-Perel' spin relaxation in a bilayer with local structural inversion asymmetry

Abstract

The spin relaxation in the D'yakonov-Perel' mechanism is theoretically studied in a symmetric doublequantum-well structure (DQWS) with an intersubband spin-orbit interaction (SOI) due to the local structural inversion asymmetry and the linear-in-wave-number Dresselhaus SOI. It is found that the spin relaxation rate induced by the intersubband SOI exhibits a suppression with ωτ p in the Lorentzian form of (1 + ω 2 τ 2 p ) −1 , wherē hω is the intersubband energy separation and τ p is the momentum relaxation time. The present Lorentzian suppression leads to a crossover with increasing ωτ p from the D'yakonov-Perel'-type relaxation (the spin relaxation time τ s ∝ τ −1 p ) to the Elliott-Yafet-type relaxation (τ s ∝ τ p ). It is also shown that the spin relaxation rate in the presence of both the linear Dresselhaus SOI and the intersubband SOI is isotropic with respect to the in-plane spin direction in the present DQWS in contrast to a single quantum well exhibiting an in-plane anisotropy.

Antiparallel Spin Polarization and Spin Current Induced by Thermal Current and Locally Broken Inversion Symmetry in a Double‐Quantum Well Structure

“…[37,38] In this study, we use both the thermal current and the locally broken inversion symmetry to produce the spin polarization (Table 1 shows the position of this study in the field). We choose the DQWS [41][42][43][44][45][46][47][48][49] as the simplest system with the locally broken inversion symmetry. In the DQWS, which is symmetric with respect to the plane between two wells, the Rashba SOI gives the antiparallel effective magnetic field.…”

Spin-current generation from local spin polarization induced by current through local inversion asymmetry: Double quantum well structure

“…As a demonstration of the spin current generation from the local CISP, we consider a symmetric double-quantumwell structure (DQWS) [38][39][40][41][42][43][44][45][46] with the Rashba spin-orbit interaction (SOI) [47][48][49][50]. The symmetric DQWS has the inversion symmetry with respect to a point between two wells and exhibits the antiparallel Rashba effective magnetic field, which produces the antiparallel CISP.…”

Antiparallel Spin Polarization Induced by Current in a Bilayer

“…In this article, we consider, as a simple system with locally broken inversion symmetry, a symmetric double-quantum-well (DQW) structure, [12,[24][25][26][27][28][29][30][31][32] as illustrated in Figure 1. This system is characterized by a double-well potential along the z direction and an additional orbital degree of freedom (layer pseudospin) consisting of jLi and jRi, localized states in the left and right wells.…”