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Transport regimes of a split gate superconducting quantum point contact in the two-dimensional LaAlO3/SrTiO3 superfluid

Author

Listed:
  • Holger Thierschmann

    (Faculty of Applied Sciences, Delft University of Technology)

  • Emre Mulazimoglu

    (Faculty of Applied Sciences, Delft University of Technology)

  • Nicola Manca

    (Faculty of Applied Sciences, Delft University of Technology)

  • Srijit Goswami

    (Faculty of Applied Sciences, Delft University of Technology
    Delft University of Technology)

  • Teun M. Klapwijk

    (Faculty of Applied Sciences, Delft University of Technology
    Moscow State University of Education)

  • Andrea D. Caviglia

    (Faculty of Applied Sciences, Delft University of Technology)

Abstract

One of the hallmark experiments of quantum transport is the observation of the quantized resistance in a point contact in GaAs/AlGaAs heterostructures. Being formed with split gate technology, these structures represent in an ideal manner equilibrium reservoirs which are connected only through a few electron mode channel. It has been a long standing goal to achieve similar experimental conditions also in superconductors. Here we demonstrate the formation of a superconducting quantum point contact (SQPC) with split gate technology in a two-dimensional superconductor, utilizing the unique gate tunability of the superfluid at the LaAlO3/SrTiO3 interface. When the constriction is tuned through the action of metallic split gates we identify three regimes of transport: First, SQPC for which the supercurrent is carried only by a few quantum transport channels. Second, superconducting island strongly coupled to the equilibrium reservoirs. Third, charge island with a discrete spectrum weakly coupled to the reservoirs.

Suggested Citation

  • Holger Thierschmann & Emre Mulazimoglu & Nicola Manca & Srijit Goswami & Teun M. Klapwijk & Andrea D. Caviglia, 2018. "Transport regimes of a split gate superconducting quantum point contact in the two-dimensional LaAlO3/SrTiO3 superfluid," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04657-z
    DOI: 10.1038/s41467-018-04657-z
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