Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Superconductivity: Heterostructures
TT 34.3: Vortrag
Dienstag, 1. April 2014, 12:00–12:15, HSZ 201
Features and functionalities of superconducting hybrids with mixed singlet and triplet states — •Pablo Burset1, Felix Keidel1, Yukio Tanaka2, Naoto Nagaosa3, and Björn Trauzettel1 — 1Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany — 2Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan — 3Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
We propose a model for a superconductor where both spin-singlet and triplet pairing amplitudes can coexist. By solving the Bogoliubov-de Gennes equations with a general pair potential that accounts for both spin states we study experimental signatures of normal metal and superconductor hybrids. The interplay between the spin-singlet and triplet correlations manifests in the appearance of two effective gaps. This double gap structure can be detected in the conductance of an isolated normal-superconductor junction. Interestingly, depending on which spin state is dominant, the conductance presents a conventional gap structure or an unconventional zero-bias peak. The form of the Andreev bound states formed at a short ballistic Josephson junction strongly depends on the spin state of the pairing amplitude at each superconductor. The periodicity of the current flowing through the junction changes for a dominant singlet or triplet pairing. Remarkably, for an arbitrary mix of the spin states, the Josephson current can be spin polarized for a certain range of the phase difference between the superconductors.