Probing Proximity Effect in Topological Insulator/Superconductor Heterostructures
ORAL
Abstract
Topological insulator (TI)/superconductor heterostructures are predicted to host Majorana zero modes, which are building blocks of topological qubit. In this work, we synthesize high-quality large-area TI/graphene (Gr)/gallium heterostructures combining confinement epitaxy and molecular beam epitaxy. Atomically thin Ga film superconducts at T_{c}~4K [B. Bersh, et. al,arXiv:1905.09938], and the growth of TI preserves its superconductivity. We probe the proximity effect in the TI film using four-terminal transport and tunneling spectroscopy. Hints of a proximity induced gap in the TI film are observed in transport measurements. We demonstrate the efficacy of a clean van der Waals tunnel junction in probing the superconducting gap of thin film NbSe_{2} and present tunneling spectroscopy measurements on TI/Gr/Ga heterostructures.
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Presenters
Cequn Li
Pennsylvania State University
Authors
Cequn Li
Pennsylvania State University
Brian Bersch
Pennsylvania State University
Natalie Briggs
Pennsylvania State University
Yifan Zhao
Pennsylvania State University
Department of Physics, The Pennsylvania State University
Department of Physics, Pennsylvania State University
Chengye Dong
Pennsylvania State University
Department of Materials Science and Engineering, The Pennsylvania State University
Timothy Bowen
Pennsylvania State University
Hemian Yi
Pennsylvania State University
Department of Physics, The Pennsylvania State University
Department of Physics, Pennsylvania State University
Joshua Robinson
Pennsylvania State University
Department of Materials Science and Engineering, The Pennsylvania State University
Department of Materials Science and Engineering, Pennsylvania State University
Cui-Zu Chang
Pennsylvania State University
Department of Physics, The Pennsylvania State University
Department of Physics, Pennsylvania State University
