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

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.

SUBMITTER: Thierschmann H 

PROVIDER: S-EPMC5995834 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Transport regimes of a split gate superconducting quantum point contact in the two-dimensional LaAlO<sub>3</sub>/SrTiO<sub>3</sub> superfluid.

Thierschmann Holger H   Mulazimoglu Emre E   Manca Nicola N   Goswami Srijit S   Klapwijk Teun M TM   Caviglia Andrea D AD  

Nature communications 20180611 1

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 contac  ...[more]

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