Magnetoelectric spectroscopy of Andreev bound states in Josephson quantum dots

Autor(en)

Nils Wentzell, Serge Florens, Tobias Meng, Volker Meden, Sabine Andergassen

Abstrakt

We theoretically investigate the behavior of Andreev levels in a single-orbital interacting quantum dot in contact with superconducting leads, focusing on the effect of electrostatic gating and applied magnetic field, as relevant for recent experimental spectroscopic studies. In order to account reliably for spin-polarization effects in the presence of correlations, we extend here two simple and complementary approaches that are tailored to capture effective Andreev levels: the static functional renormalization group (fRG) and the self-consistent Andreev bound states (SCABS) theory. We provide benchmarks against the exact large-gap solution as well as renormalization group (NRG) calculations and find good quantitative agreement in the range of validity. The large flexibility of the implemented approaches then allows us to analyze a sizable parameter space, allowing us to get a deeper physical understanding into the Zeeman field, electrostatic gate, and flux dependence of Andreev levels in interacting nanostructures.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Technische Universität Wien, Eberhard Karls Universität Tübingen, Centre National De La Recherche Scientifique (CNRS), Technische Universität Dresden, Rheinisch-Westfälische Technische Hochschule Aachen, JARA Fundamentals of Future Information Technology

Journal

Physical Review B

Band

94

Anzahl der Seiten

14

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.94.085151

Publikationsdatum

08-2016

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/17bd2f91-546b-4c08-96e9-a7a887a9d4bd