Understanding the superconducting proximity effect in semiconductors through quantum oscillations
Abstract
Superconductor-semiconductor hybrids host emergent states of matter and offer a platform for new qubits, but the superconducting metal shunts electrical transport, which rules out conventional semiconductor characterization and leaves the hybrid parameters to speculation. Here we determine density, mass, g-factor, mobility and subband occupation beneath the superconductor, from Shubnikov-de Haas oscillations of a buried InAs quantum well under Al, Sn, V, Nb, Ta and Re films, with a Dingle analysis that accounts for the shunt. Every metal adds an interface subband whose occupation falls into one of two classes, whereas the mass and g-factor of the buried well are unchanged to within 10\%. Within the uncertainty set by the transport mobility, no film shortens the quantum lifetime of the buried well, and Al and Sn lengthen it. Quantum lifetimes bound the hybridization of the interface subband to 2-4~meV. These measurements supply the normal-state parameters that tunnelling spectroscopy renormalizes but cannot measure.
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BibTeX
@misc{coombs2026understanding,
title = {{Understanding the superconducting proximity effect in semiconductors through quantum oscillations}},
author = {Milo Coombs and Teun A. J. van Schijndel and Yu Wu and Jason T. Dong and Yilmaz Gul and Julian Choi and Christopher J. Palmstrøm and Greg P. Mazur},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01593},
eprint = {2609.01593},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01593},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Understanding the superconducting proximity effect in semiconductors through quantum oscillations
AU - Milo Coombs
AU - Teun A. J. van Schijndel
AU - Yu Wu
AU - Jason T. Dong
AU - Yilmaz Gul
AU - Julian Choi
AU - Christopher J. Palmstrøm
AU - Greg P. Mazur
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01593
UR - https://arxiv.org/abs/2609.01593
AB - Superconductor-semiconductor hybrids host emergent states of matter and offer a platform for new qubits, but the superconducting metal shunts electrical transport, which rules out conventional semiconductor characterization and leaves the hybrid parameters to speculation. Here we determine density, mass, g-factor, mobility and subband occupation beneath the superconductor, from Shubnikov-de Haas oscillations of a buried InAs quantum well under Al, Sn, V, Nb, Ta and Re films, with a Dingle analysis that accounts for the shunt. Every metal adds an interface subband whose occupation falls into one of two classes, whereas the mass and g-factor of the buried well are unchanged to within 10\%. Within the uncertainty set by the transport mobility, no film shortens the quantum lifetime of the buried well, and Al and Sn lengthen it. Quantum lifetimes bound the hybridization of the interface subband to 2-4~meV. These measurements supply the normal-state parameters that tunnelling spectroscopy renormalizes but cannot measure.
ER -