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

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 excitatio...

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Bibliographic Details
Published in:Physical review. B 2021-06, Vol.103 (23), p.1, Article 235201
Main Authors: Puglia, D., Martinez, E. A., Ménard, G. C., Pöschl, A., Gronin, S., Gardner, G. C., Kallaher, R., Manfra, M. J., Marcus, C. M., Higginbotham, A. P., Casparis, L.
Format: Article
Language:English
Subjects:
Bias
Nanowires
Phase transitions
Resistance
Superconductivity
Topology
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.235201