Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Superconductivity: Tunneling and Josephson Junctions
TT 34.7: Vortrag
Dienstag, 13. März 2018, 11:30–11:45, H 2053
Transport properties of an electron-hole bilayer/superconductor hybrid junction — •D. Bercioux1,2, T.M. Klapwijk3, and F.S. Bergeret1,4 — 1Donostia International Physics Center (DIPC), Manuel de Lardizbal 4, E-20018 San Sebastián, Spain — 2IKERBASQUE, Basque Foundation of Science, 48011 Bilbao, Spain — 3Kavli Institute of Nanoscience Delft University of Technology — 4Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Spain
We investigate the transport properties of an electron-hole bilayer (EBL) contacted with normal and superconducting leads. We assume that the EBL hosts an exciton condensate (EC) described by a BCS-like model with a gap in the quasiparticle density of states.
Contrary to the existing proposal based on Coulomb drag measurements [1,2], we show that the existence of the EC via transport measurements in the sub-gap regime. Here, transport properties are determined by the competition of the standard Andreev reflection at the interface between the superconductor/EC with crossed reflection at the semi-metal/EC. The latter converts electrons from one layer to the other [2]. We show that the existence of a finite gap manifests in a minimum of the conductance at low voltage bias [3].
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