Experimental Verification of a Spin-Interference Device Action

TL;DR

This paper experimentally demonstrates spin interference in a quantum dot-based Aharonov-Bohm interferometer, showing quantum dots can act as spin rotators and the interference depends on spin polarization and phase modulation.

Contribution

It provides the first experimental verification of spin interference effects in a quantum dot interferometer, highlighting the role of quantum dots as spin rotators.

Findings

Spin interference signal detected in the device.

Quantum dots can function as efficient spin rotators.

Interference pattern depends on spin polarization and phase modulation.

Abstract

We report the detection of spin interference signal in an Aharonov-Bohm type interferometer with quantum dots on the conduction paths. We have found that resonators like quantum dots can work as efficient spin rotators. The interference signal appears only when spin-polarized electrons are injected into the device. The interference pattern in the gate voltage-magnetic field plane is checker board like, ensuring the modulation of spin wavefunction's phase as well as the orbital phase.