Spin relaxation rates in quasi-one-dimensional coupled quantum dots

Abstract

We study theoretically the spin relaxation rate in quasi-one-dimensional coupled double semiconductor quantum dots. We consider InSb and GaAs-based systems in the presence of the Rashba spin-orbit interaction, which causes mixing of opposite-spin states, and allows phonon-mediated transitions between energy eigenstates. Contributions from all phonon modes and coupling mechanisms in zincblende semiconductors are taken into account. The spin relaxation rate is shown to display a sharp, cusp-like maximum as function of the interdot-barrier width, at a value of the width which can be controlled by an external magnetic field. This remarkable behavior is associated with the symmetric-antisymmetric level splitting in the structure.Comment: 4 figures, Submitted to Applied Physics Letter

Spin hot spots in single‐electron GaAs‐based quantum dots

“…30,31 Motivated by these recent experiments, here we investigate the spin relaxation in a single electron biased weakly coupled double dot in GaAs. [32][33][34][35][36][37][38] This complements our studies of single electron unbiased double dots 15,25,26 and two electron biased double dots. 28 We investigate the relaxation rates anisotropy with respect to the in-plane magnetic field orientation, and compare the spin-orbit and nuclear fields effectiveness to induce the electron spin relaxation in in-plane and out-of-plane magnetic fields.…”

“…Motivated by these recent experiments, here we investigate the spin relaxation in a single electron biased weakly coupled double dot in GaAs . This complements our studies of single electron unbiased double dots and two electron biased double dots ().…”

Nonlinear spin-charge dynamics in a driven double quantum dot

“…Most of the studies of spin dynamics in systems not driven by external field have been performed so far for the two-dimensional lateral QDs. However, one-dimensional systems, including quantum wires and wire-based QDs are of interest 21,22,23 , promising for the applications and can be treated by a thorough analysis of various double-QD problems. 23 In this paper we concentrate on these systems, which demonstrate all important for the understanding features of the coupled spin-charge dynamics in driven systems.…”

Spin Tunneling and Manipulation in Nanostructures

“…5 Here we consider the joint effects of tunneling and spin orbit coupling in one-dimensional nanostructures. As examples we consider (i) the spin manipulation in single-electron double quantum dots [6][7][8][9][10][11] by periodic external fields and (ii) formation of spin density patterns in the tunneling process. In these single-electron problems, spin dynamics is solely due to the spin-orbit coupling rather than due to spindependent electron-electron Coulomb interaction.…”