Large anisotropy of spin-orbit interaction in a single InAs self-assembled quantum dot

TL;DR

This study investigates the anisotropic spin-orbit interaction in a single InAs quantum dot, revealing strong directional dependence and quenching effects, with results aligning with Rashba SOI calculations.

Contribution

It provides the first detailed measurement of anisotropic SOI in a single InAs quantum dot, highlighting angular dependence and quenching phenomena.

Findings

SOI energy exhibits cosine angular dependence

SOI is quenched at specific orientations

Results agree with Rashba SOI calculations

Abstract

Anisotropy of spin-orbit interaction (SOI) is studied for a single uncapped InAs self-assembled quantum dot (SAQD) holding just a few electrons. The SOI energy is evaluated from anti-crossing or SOI induced hybridization between the ground and excited states with opposite spins. The magnetic angular dependence of the SOI energy falls on an absolute cosine function for azimuthal rotation, and a cosine-like function for tilting rotation. The SOI energy is even quenched at a specific rotation. These angular dependence compare well to calculation of Rashba SOI in a two-dimensional harmonic potential.