Spin transmission through quantum dots with strong spin-orbit interaction

TL;DR

This paper investigates how spin conductance oscillates in 2D quantum dots with strong spin-orbit interaction, revealing geometry-dependent spectral features through numerical simulations.

Contribution

It provides a numerical analysis of spin oscillations in quantum dots with varying geometries, highlighting the impact of classical trajectories on spectral properties.

Findings

Narrow rings show a single dominant peak in spectra.

Regular quantum dots exhibit multiple spectral peaks.

Chaotic quantum dots display a quasicontinuum spectrum.

Abstract

Quantum oscillations of the spin conductance through regular and chaotic 2D quantum dots under the varying Rashba spin orbit interaction and at zero magnetic field have been numerically calculated by summing up the spin evolution matrices for classical transmitting trajectories. Fourier analysis of these oscillations showed power spectra strongly dependent on the dot geometry. For narrow rings the spectra are dominated by a single peak in accordance with previous analytic results. In other geometries the spectra are represented by multiple peaks for regular QD and quasicontinuum for chaotic QD.