Zeeman-driven parity transitions in an Andreev quantum dot
Alexander Whiticar, Antonio Fornieri, Abhishek Banerjee, A. C. C. Drachmann, Sergei Gronin, G. C. Gardner, Tyler Lindemann, Michael J. Manfra, C. M. Marcus
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 an 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-$\ensuremath{\pi}$ transition in the superconducting phase across the dot. We further demonstrate that flux through the interferometer modulates both dot parity and 0-$\ensuremath{\pi}$ transitions.
Topics & Concepts
Zeeman effectPhysicsQuantum dotSuperconductivityCondensed matter physicsInterferometryParity (physics)Magnetic fieldMagnetic flux quantumMagnetic fluxQuantum phase transitionPhase transitionQuantum mechanicsJosephson effectQuantum and electron transport phenomenaTopological Materials and PhenomenaCold Atom Physics and Bose-Einstein Condensates