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TT: Fachverband Tiefe Temperaturen

TT 9: Transport: Quantum Dots, Quantum Wires, Point Contacts I (organized by TT)

TT 9.7: Vortrag

Montag, 31. März 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.