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

Holger Thierschmann (), Emre Mulazimoglu, Nicola Manca, Srijit Goswami, Teun M. Klapwijk and Andrea D. Caviglia ()
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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
Teun M. Klapwijk: Faculty of Applied Sciences, Delft University of Technology
Andrea D. Caviglia: Faculty of Applied Sciences, Delft University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-04657-z

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