Work

Andreev bound state spectroscopy of a quantum-dot-based Aharonov-Bohm interferometer with superconducting terminals

Year: 2026

Type: article

Abstract: We analytically and numerically investigate an Aharonov-Bohm interferometer with two superconducting terminals and a strongly correlated quantum dot in one arm. Through a rigorous derivation, we prove that this double-path interferometer is spectrally equivalent to a simpler system: an interacting quantum dot coupled to a noninteracting side-coupled proximitized mode and a semiconductor lead. This equivalence reveals a simple interpretation of the interferometer's behavior through the competition of a geometric factor χ , a key parameter characterizing the anomalous part of the hybridization function, with the properties of the side-coupled mode. We identify the conditions for the formation of doublet chimney in the phase diagrams in more general setting. Moreover, we show how the obtained Andreev bound state spectra clearly indicate the presence of Josephson diode effect generated by interferometric phenomena.

Source: Physical review. B./Physical review. B

DOI: 10.1103/32tz-hmwr

Authors: Peter Zalom, Don Rolih, Rok Žitko

Institutions: Czech Academy of Sciences, University of Ljubljana, Jožef Stefan Institute, Jožef Stefan International Postgraduate School

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Grantová Agentura České Republiky, Javna Agencija za Raziskovalno Dejavnost RS

Awards: Physics of quantum technologies, G3708067221, Coulombic subgap states in superconducting quantum devices, G4177337698, Superconducting nanohybrids out of equilibrium