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TT: Fachverband Tiefe Temperaturen

TT 8: Topological Insulators I (joint session HL/TT)

TT 8.2: Vortrag

Montag, 12. März 2018, 09:45–10:00, A 151

Transport Spectroscopy of Induced Superconductivity in the three-dimensional Topological Insulator HgTe — •Jonas Wiedenmann — Experimentelle Physik III, Universität Würzburg, Am Hubland, 97074 Würzburg

Inducing superconducting pairing into the surface states of a topological insulator is predicted to lead to the emergence of mixed spin singlet/triplet superconducting correlations and Majorana bound state related physics. We studied the proximity-induced superconducting state into the topological surface states of strained bulk HgTe by Andreev reflection point-contact spectroscopy. By analyzing the conductance as a function of voltage for various temperatures, magnetic fields and gate-voltages, we find evidence, in equilibrium, for an induced order parameter in HgTe of 0.070 meV and an order parameter of the superconducting gap of niobium of 1.1 meV. To describe the full conductance curve we suggest that a charge imbalance suppresses the induced superconducting state. As a result the relevant scattering region changes depending on the applied bias voltage.