Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover
By H. Churchill, V. Fatemi, K. Grove‐Rasmussen, M. Deng, P. Caroff, Hongqi Xu, Charles M. Marcus. 2013
511 citations recorded by the source corpus.
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.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/00007a74f273165f7d70c6b9574fdea5d37e1919
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Universal topological quantum computation from a superconductor/Abelian quantum Hall heterostructure (2013, background): “Studies of semiconducting wires in-terfaced with s -wave superconductors have proven particularly fruitful, delivering numerous possible Majorana signatures [73–78].”
- Nonlocality of Majorana modes in hybrid nanowires (2017, background): “Therefore, beyond observing zero-bias peaks [13–23], the overlap of the two Majorana components, or degree of nonlocality, provides a metric of topological protection, or quality factor, for qubits realized through zero-energy”
- Induced superconductivity in the quantum spin Hall edge (2013, background): “Effort in this direction has been advanced by studies of nanowire systems [13, 14, 15, 16, 17, 18] and by excess current measurements on InAs/GaSb devices [19].”
- Parity lifetime of bound states in a proximitized semiconductor nanowire (2015, background): “Transport experiments on semiconductor nanowires proximitized by a grounded superconductor have recently revealed characteristic features of Majorana modes [25– 28].”