Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 9: Transport: Quantum Dots, Quantum Wires, Point Contacts I (organized by TT)
TT 9.7: Talk
Monday, March 31, 2014, 11:00–11:15, BEY 81
Magneto-electric spectroscopy of Andreev bound states in Josephson quantum dots — •Nils Wentzell1, Tobias Meng2, Volker Meden3, Sabine Andergassen1, and Serge Florens4 — 1University of Vienna — 2University of Basel — 3RWTH Aachen University — 4CNRS Grenoble
We theoretically investigate the behavior of Andreev levels in a single-orbital interacting quantum dot in contact to 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 presence of strong correlations, we further extend here two simple and complementary approaches that are tailored to capture effective Andreev levels: the static functional renormalization group and the self-consistent Andreev bound states theory. We provide a systematic analysis of the Andreev level spectroscopy for the full electric and magnetic tuning available in quantum dot devices.