Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Topological Insulators (joint session TT/MA)

TT 3.9: Vortrag

Montag, 1. April 2019, 11:45–12:00, Theater

Crossed Andreev reflection in Superconductor-TI nanowire junctions — •Michael Barth, Jacob Fuchs, Cosimo Gorini, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, Germany

Topological Insulators (TIs) are materials with an ordinary bulk band gap and metallic surface/edge states. The latter are helical, meaning that we have spin-momentum-locking, and they are topologically protected by time-reversal symmetry [1]. Topologically non-trivial superconducting states can be obtained by putting a TI in close proximity to a normal superconductor. This kind of system is characterized by modifications of phenomena such as crossed Andreev reflection [2], which for example can be fully suppressed in 2-dimensional TIs [3]. We consider instead a hybrid 3-dimensional TI - superconductor T-junction, where crossed Andreev reflection is in principle tunable via external magnetic fields. This is confirmed by our 3D numerical simulations for T-junctions, showing clear signatures of tunable crossed-Andreev reflection.
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