Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover

Churchill, H. O. H. ; Fatemi, V. ; Grove-Rasmussen, K. ; Deng, Mingtang LU ; Caroff, Philippe LU ; Xu, Hongqi LU and Marcus, C. M. (2013) In Physical Review B (Condensed Matter and Materials Physics) 87(24).
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 similar to 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.
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
87
issue
24
article number
241401
publisher
American Physical Society
external identifiers
  • wos:000320108700001
  • scopus:84879022519
ISSN
1098-0121
DOI
10.1103/PhysRevB.87.241401
language
English
LU publication?
yes
id
0f04c549-4915-4ad7-8401-df529871172e (old id 3990284)
date added to LUP
2016-04-01 14:59:51
date last changed
2023-11-13 14:31:50
@article{0f04c549-4915-4ad7-8401-df529871172e,
  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 similar to 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.}},
  author       = {{Churchill, H. O. H. and Fatemi, V. and Grove-Rasmussen, K. and Deng, Mingtang and Caroff, Philippe and Xu, Hongqi and Marcus, C. M.}},
  issn         = {{1098-0121}},
  language     = {{eng}},
  number       = {{24}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B (Condensed Matter and Materials Physics)}},
  title        = {{Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.87.241401}},
  doi          = {{10.1103/PhysRevB.87.241401}},
  volume       = {{87}},
  year         = {{2013}},
}