Die u:cris Detailansicht:

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