Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 63: Poster: Enabling Technologies: Quantum Materials, Quantum Dots, Quantum Wires, Point Contacts and Superconducting Systems

FM 63.12: Poster

Mittwoch, 25. September 2019, 16:30–18:30, Tents

Crossed Andreev reflection in 3d TI-superconductor nanowire hybrid systems — •Michael Barth, Jacob Fuchs, Cosimo Gorini, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, Germany

3d topological insulator (TI) nanowires are materials with helical surface states which are protected by time-reversal symmetry [1]. By bringing a normal s-wave superconductor into close proximity to such a wire one can create a topologically non-trivial superconducting state. Furthermore, in such hybrid systems of normal and superconducting materials the process of crossed Andreev reflection (CAR) [2] can occur. This is the effect we are interested in and therefore we are studying quantum transport in a 3d T-junction of normal TIs and a topological superconductor with additional external magnetic fields. Even though in 2d TI systems this phenomenon can be fully suppressed [3], our full 3d numerical simulations show clear signatures of CAR. Moreover in our setup the CAR can in principle be tuned by the external magnetic fields.

[1] J. Ziegler et al., Phys. Rev. B 97, 035157 (2018)

[2] G. Falci, D. Feinberg, and F. W. J. Hekking, EPL 54, 255 (2001)

[3] P. Adroguer et al., Phys. Rev. B 82, 081303 (2010)