Current–phase relations of few-mode InAs nanowire Josephson junctions

Spanton, Eric M.; Deng, Mingtang; Vaitiekėnas, Saulius; Krogstrup, Peter; Nygård, Jesper; Marcus, Charles M.; Moler, Kathryn A.

doi:10.1038/nphys4224

Title: Current–phase relations of few-mode InAs nanowire Josephson junctions

Journal Article · Mon Aug 14 00:00:00 EDT 2017 · Nature Physics

DOI:https://doi.org/10.1038/nphys4224· OSTI ID:1419942

^[1]; Deng, Mingtang ^[2];

^[3]; Krogstrup, Peter ^[4]; Nygård, Jesper ^[4]; Marcus, Charles M. ^[4]; Moler, Kathryn A. ^[5]

SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Physics
Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Center for Quantum Devices and Station Q Copenhagen; National Univ. of Defense Technology (NUDT), Changsha (China). State Key Lab. of High Performance Computing
Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Center for Quantum Devices and Station Q Copenhagen; Freie Univ., Berlin (Germany). Dept. of Physics
Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Center for Quantum Devices and Station Q Copenhagen
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States). Dept. of Applied Physics

Gate-tunable semiconductor nanowires with superconducting leads have great potential for quantum computation and as model systems for mesoscopic Josephson junctions. The supercurrent, I, versus the phase, Φ, across the junction is called the current–phase relation (CPR). It can reveal not only the amplitude of the critical current, but also the number of modes and their transmission. Here, we measured the CPR of many individual InAs nanowire Josephson junctions, one junction at a time. Both the amplitude and shape of the CPR varied between junctions, with small critical currents and skewed CPRs indicating few-mode junctions with high transmissions. In a gate-tunable junction, we found that the CPR varied with gate voltage: near the onset of supercurrent, we observed behaviour consistent with resonant tunnelling through a single, highly transmitting mode. The gate dependence is consistent with modelled subband structure that includes an effective tunnelling barrier due to an abrupt change in the Fermi level at the boundary of the gate-tuned region. These measurements of skewed, tunable, few-mode CPRs are promising both for applications that require anharmonic junctions and for Majorana readout proposals.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Danish National Research Foundation; Lundbeck Foundation; Carlsberg Foundation; European Commission (EC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1419942

Journal Information:: Nature Physics, Vol. 13, Issue 12; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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