Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 14: Poster: Two-Dimenaional Materials and Topological Insulators

HL 14.15: Poster

Monday, March 20, 2017, 14:00–18:00, P2-OG3

Towards one-dimensional topological Josephson junctions on molecular beam grown topological insulator thin films — •Tobias W. Schmitt, Daniel Rosenbach, Peter Schüffelgen, Martin Lanius, Michael Schleenvoigt, Gregor Mussler, Stefan Trellenkamp, Detlev Grützmacher, and Thomas Schäpers — Peter Grünberg Institute 9, Forschungszentrum Jülich & JARA-FIT, 52425 Jülich, Germany

Lateral topological Josephson junctions comprised of two superconducting leads on top of a topological insulator thin film are one way to probe possible Majorana excitations. These exotic quasiparticles are predicted to arise at the interface of a conventional s-wave superconductor to a topological non-trivial surface and possess similar properties as the long sought Majorana fermion. A current across such topological Josephson junctions however does not only contain information about possible Majorana assisted transport but also transport by conventional Andreev bound states.

The contribution of the conventional Andreev bound states to the supercurrent depends on the width of the junction. In a quasi one-dimensional system the width of the junction therefore is adjusted to the Fermi wavelength to allow for only two possible conducting modes, the Majorana bound states. In our recent work we focus on the realization of quasi one-dimensional topological Josephson junctions by selectively depositing topological insulator nanoribbons of reduced width and by increasing the Fermi wavelength by adjusting the Fermi level to the Dirac point of the linear disperse surface states.