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 Communjournal_title
Nature communicationsauthors
Thierschmann H,Mulazimoglu E,Manca N,Goswami S,Klapwijk TM,Caviglia ADdoi
10.1038/s41467-018-04657-zsubject
Has Abstractpub_date
2018-06-11 00:00:00pages
2276issue
1issn
2041-1723pii
10.1038/s41467-018-04657-zjournal_volume
9pub_type
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