Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Topology: Majorana Physics

TT 53.6: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, HSZ 103

Transport signatures of topological superconductivity in HgTe-based quantum wells — •Elena G. Novik1,2, Björn Trauzettel3, and Patrik Recher4,51Dresden High Magnetic Field Laboratory, HZDR, Dresden — 2Institute of Theoretical Physics, Technische Universität Dresden — 3Institute of Theoretical Physics and Astrophysics, University of Würzburg — 4Institute for Mathematical Physics, TU Braunschweig — 5Laboratory for Emerging Nanometrology Braunschweig

We investigate transport through a normal-superconductor junction composed of a quantum spin Hall insulator with helical edge channels and a chiral topological superconductor (TSC) made of the same material in contact to an s-wave bulk superconductor and subjected to a magnetic field. Using the extended two-dimensional Bernevig-Hughes-Zhang model (including axial spin symmetry breaking terms, induced s-wave superconductivity and a Zeeman field) in a ribbon geometry we show that the emergence of the TSC is represented by regions of conductance quantization at zero energy being either 4e2/h in a trivial phase of the TSC or 2e2/h being the indication of a non-trivial phase for the TSC. The latter phase can be traced back to Majorana bound states appearing at the NS interface in this ribbon geometry. These features occur only inside the two-dimensional topological non-trivial phase with non-zero Chern number when the sample width largely exceeds the extent of the chiral Majorana edge channels which is on the order of the superconducting coherence length.

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