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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.25: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Proximity-induced superconductivity in Pd/(Bi_1−xSb_x)₂Te₃ heterostructures — •Mengmeng Bai¹, Fan Yang¹, Andrea Bliesener¹, Gertjan Lippertz¹, Martina Luysberg², Alexey Taskin¹, Joachim Mayer², and Yoichi Ando¹ — ¹Physics Institute II, University of Cologne, 50937 Cologne, Germany — ²Forschungszentrum Jülich GmbH, Ernst Ruska-Centrum, 52425 Jülich, Germany

Josephson junctions (JJs) based on topological insulators (TIs) are interesting because of the possibility to generate Majorana fermions. Previous reports on TI–based JJs have employed deposited superconducting films such as Al and Nb for proximitization, which inevitably faces the challenge of the interface quality. In fact, the transparency of the JJs reported so far has been limited. Here we report that simply sputtering Pd on MBE–grown (Bi_1−xSb_x)₂Te₃ (BST) thin films naturally gives us a superconducting layer due to an epitaxial alloy formation at the interface. This superconducting layer allows us to fabricate JJ devices which show dissipationless supercurrents below a critical temperature of 0.9 K, confirming a strong proximity effect on the TI surface.