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Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover
Open accessAbstract
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 $\ensuremath{\sim}$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.
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Metadata
- Authors
- Churchill, H. O. H., Fatemi, V., Grove-Rasmussen, K., Deng, M. T., Caroff, P., Xu, H. Q., & Marcus, C. M.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2013-06-06
- Volume
- 87
- Issue
- 24
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2088300719
- Cited by
- 771
- References
- 39
- FWCI
- 50.37
- Type
- journal article
- Language
- en
- Open access
- green
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