Electric-field-induced interferometric resonance of a one-dimensional spin-orbit-coupled electron

TL;DR

This paper proposes a novel electric-field-controlled interferometry scheme in a spin-orbit-coupled quantum dot, enabling precise measurement of spin-orbit coupling parameters and magnetic properties through interference patterns.

Contribution

It introduces a new electric mechanism for electron orbit interference in a 1D spin-orbit-coupled quantum dot, with potential for high-precision parameter measurement.

Findings

Interference patterns are generated by spin-orbit states under pulsed electric fields.

In-plane magnetic fields cause weak shifts but do not affect resonance intervals.

The scheme can accurately measure spin-orbit coupling strengths and g-factors.

Abstract

We consider a one-dimensional spin-orbit-coupled nanowire quantum dot, driven by external electric and magnetic fields, and theoretically formulate an electric mechanism to interfere its electron orbits. Owing to the existence of spin-orbit coupling and a pulsed electric field, different spin-orbit states are shown to interfere with each other, generating intriguing interference-resonant patterns. We also reveal that an in-plane magnetic field does not affect the strength interval of any neighboring resonant peaks, but contributes a weak shift of each peak, which is sensitive to the direction of the magnetic field. We find that this proposed external-field-controlled scheme should be regarded as a new type of quantum-dot-based interferometry. Finally, this interferometry has an important application in precisely measuring relative experimental parameters, such as the Rashba and Dresselhaus spin-orbit-coupling strengths, as well as the Lande-g factor.