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

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  • D. Puglia
  • E. A. Martinez
  • G. C. Menard
  • A. Poschl
  • S. Gronin
  • G. C. Gardner
  • R. Kallaher
  • M. J. Manfra
  • Marcus, Charles M.
  • A. P. Higginbotham
  • L. Casparis

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.

Original languageEnglish
Article number235201
JournalPhysical Review B
Volume103
Issue number23
Number of pages9
ISSN2469-9950
DOIs
Publication statusPublished - 8 Jun 2021

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