Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover
Name
Churchill-2013-Superconductor-nanowire devices.pdf
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Author(s)
Grove-Rasmussen, K.
Deng, M. T.
Caroff, P.
Xu, H. Q.
Marcus, Charles M.
Churchill, Hugh Olen Hill
Fatemi, Valla
Date Issued
June 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Churchill, H. O. H., V. Fatemi, K. Grove-Rasmussen, M. T. Deng, P. Caroff, H. Q. Xu, and C. M. Marcus. "Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover." Phys. Rev. B 87, 241401(R) (June 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We present transport measurements in superconductor-nanowire devices with a gated constriction forming a quantum point contact. Zero-bias features in tunneling spectroscopy appear at finite magnetic fields and oscillate in amplitude and split away from zero bias as a function of magnetic field and gate voltage. A crossover in magnetoconductance is observed: Magnetic fields above ∼0.5 T enhance conductance in the low-conductance (tunneling) regime but suppress conductance in the high-conductance (multichannel) regime. We consider these results in the context of Majorana zero modes as well as alternatives, including the Kondo effect and analogs of 0.7 structure in a disordered nanowire.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.87.241401
