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Title: Current-phase relations of InAs nanowire Josephson junctions: From interacting to multimode regimes

Abstract

Gate-tunable semiconductor-superconductor nanowires with superconducting leads form exotic Josephson junctions that are a highly desirable platform for two types of qubits: Those with topological superconductivity (Majorana qubits) and those based on tunable anharmonicity (gatemon qubits). Controlling their behavior, however, requires understanding their electrostatic environment and electronic structure. Here we study gated InAs nanowires with epitaxial aluminum shells. By measuring current-phase relations and comparing them with analytical and numerical calculations, we show that we can tune the number of modes, determine the transparency of each mode, and tune into regimes in which electron-electron interactions are apparent, indicating the presence of a quantum dot. To take into account electrostatic and geometrical effects, we perform microscopic self-consistent Schrodinger-Poisson numerical simulations, revealing the energy spectrum of Andreev states in the junction as well as their spatial distribution. Here, our work systematically demonstrates the effect of device geometry, gate voltage, and phase bias on mode behavior, providing insights into ongoing experimental efforts and predictive device design.

Authors:
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [2];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  2. Univ. of Copenhagen, Copenhagen (Denmark)
  3. Microsoft Research, Santa Barbara, CA (United States)
  4. Univ. of Copenhagen, Copenhagen (Denmark); Univ. of Copenhagen, Lyngby (Denmark)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1562488
Alternate Identifier(s):
OSTI ID: 1558830
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Hart, Sean, Cui, Zheng, Ménard, Gerbold, Deng, Mingtang, Antipov, Andrey E., Lutchyn, Roman M., Krogstrup, Peter, Marcus, Charles M., and Moler, Kathryn A. Current-phase relations of InAs nanowire Josephson junctions: From interacting to multimode regimes. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.064523.
Hart, Sean, Cui, Zheng, Ménard, Gerbold, Deng, Mingtang, Antipov, Andrey E., Lutchyn, Roman M., Krogstrup, Peter, Marcus, Charles M., & Moler, Kathryn A. Current-phase relations of InAs nanowire Josephson junctions: From interacting to multimode regimes. United States. doi:10.1103/physrevb.100.064523.
Hart, Sean, Cui, Zheng, Ménard, Gerbold, Deng, Mingtang, Antipov, Andrey E., Lutchyn, Roman M., Krogstrup, Peter, Marcus, Charles M., and Moler, Kathryn A. Mon . "Current-phase relations of InAs nanowire Josephson junctions: From interacting to multimode regimes". United States. doi:10.1103/physrevb.100.064523.
@article{osti_1562488,
title = {Current-phase relations of InAs nanowire Josephson junctions: From interacting to multimode regimes},
author = {Hart, Sean and Cui, Zheng and Ménard, Gerbold and Deng, Mingtang and Antipov, Andrey E. and Lutchyn, Roman M. and Krogstrup, Peter and Marcus, Charles M. and Moler, Kathryn A.},
abstractNote = {Gate-tunable semiconductor-superconductor nanowires with superconducting leads form exotic Josephson junctions that are a highly desirable platform for two types of qubits: Those with topological superconductivity (Majorana qubits) and those based on tunable anharmonicity (gatemon qubits). Controlling their behavior, however, requires understanding their electrostatic environment and electronic structure. Here we study gated InAs nanowires with epitaxial aluminum shells. By measuring current-phase relations and comparing them with analytical and numerical calculations, we show that we can tune the number of modes, determine the transparency of each mode, and tune into regimes in which electron-electron interactions are apparent, indicating the presence of a quantum dot. To take into account electrostatic and geometrical effects, we perform microscopic self-consistent Schrodinger-Poisson numerical simulations, revealing the energy spectrum of Andreev states in the junction as well as their spatial distribution. Here, our work systematically demonstrates the effect of device geometry, gate voltage, and phase bias on mode behavior, providing insights into ongoing experimental efforts and predictive device design.},
doi = {10.1103/physrevb.100.064523},
journal = {Physical Review B},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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