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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Thierschmann H,Mulazimoglu E,Manca N,Goswami S,Klapwijk TM,Caviglia AD

doi

10.1038/s41467-018-04657-z

subject

Has Abstract

pub_date

2018-06-11 00:00:00

pages

2276

issue

1

issn

2041-1723

pii

10.1038/s41467-018-04657-z

journal_volume

9

pub_type

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