Closing of the induced gap in a hybrid superconductor-semiconductor nanowire

作     者：D. Puglia E. A. Martinez G. C. Ménard A. Pöschl S. Gronin G. C. Gardner R. Kallaher M. J. Manfra C. M. Marcus A. P. Higginbotham L. Casparis 

作者机构：Microsoft Quantum Labs Copenhagen and Center for Quantum Devices Niels Bohr Institute University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark Institute of Science and Technology Austria Am Campus 1 3400 Klosterneuburg Austria Microsoft Quantum Purdue and Birck Nanotechnology Center Purdue University West Lafayette Indiana 47907 USA Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA School of Materials Engineering Purdue University West Lafayette Indiana 47907 USA School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2021年第103卷第23期

页      面：235201-235201页

核心收录：

基　　金：Microsoft Project Villum Fonden 

主　　题：Majorana fermions Topological materials Topological phases of matter Topological superconductors Nanowires 

摘      要：We present conductance-matrix measurements in long, three-terminal hybrid superconductor-semiconductor nanowires, and compare with theoretical predictions of a magnetic-field-driven, topological quantum phase transition. By examining the nonlocal conductance, we identify the closure of the excitation gap in the bulk of the semiconductor before the emergence of zero-bias peaks, ruling out spurious gap-closure signatures from localized states. We observe that after the gap closes, nonlocal signals and zero-bias peaks fluctuate strongly at both ends, inconsistent with a simple picture of clean topological superconductivity.