Zeeman-driven parity transitions in an Andreev quantum dot

TL;DR

This paper investigates how Zeeman splitting influences parity and 0-π transitions in an Andreev quantum dot, revealing controllable quantum state changes via magnetic flux and gating.

Contribution

It demonstrates Zeeman-driven parity transitions and their interplay with flux-induced 0-π transitions in an Andreev quantum dot system.

Findings

Zeeman splitting induces parity transitions in the quantum dot.

Flux modulates both parity and 0-π transitions.

Zeeman-driven 0-π transition observed in the system.

Abstract

The Andreev spectrum of a quantum dot embedded in a hybrid semiconductor-superconductor interferometer can be modulated by electrostatic gating, magnetic flux through the interferometer, and Zeeman splitting from in-plane magnetic field. We demonstrate parity transitions in the embedded quantum dot system, and show that the Zeeman-driven transition is accompanied by a 0-{\pi} transition in the superconducting phase across the dot. We further demonstrate that flux through the interferometer modulates both dot parity and 0-{\pi} transitions.