Print Email Facebook Twitter Transport regimes of a split gate superconducting quantum point contact in the two-dimensional LaAlO3/SrTiO3 superfluid Title Transport regimes of a split gate superconducting quantum point contact in the two-dimensional LaAlO3/SrTiO3 superfluid Author Thierschmann, R. (TU Delft QN/Klapwijk Lab) Mulazimoglu, E. (TU Delft QN/Caviglia Lab) Manca, N. (TU Delft QN/Caviglia Lab) Goswami, S. (TU Delft QuTech Advanced Research Centre; TU Delft QRD/Goswami Lab) Klapwijk, T.M. (TU Delft QN/Klapwijk Lab; Chemistry Faculty of M. V. Lomonosov Moscow State University) Caviglia, A. (TU Delft QN/Caviglia Lab) Date 2018-12-01 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. Subject OA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:cf9518d1-db28-4475-9e60-fd3c5f455aa9 DOI https://doi.org/10.1038/s41467-018-04657-z ISSN 2041-1723 Source Nature Communications, 9 (1) Part of collection Institutional Repository Document type journal article Rights © 2018 R. Thierschmann, E. Mulazimoglu, N. Manca, S. Goswami, T.M. Klapwijk, A. Caviglia Files PDF s41467_018_04657_z.pdf 1.2 MB Close viewer /islandora/object/uuid:cf9518d1-db28-4475-9e60-fd3c5f455aa9/datastream/OBJ/view