Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas

Fabio Deon; Vittorio Pellegrini; Francesco Giazotto; Giorgio Biasiol; Lucia Sorba; Fabio Beltram

doi:10.1063/1.3570660

Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas

Mesoscale and Nanoscale Physics 2011-04-15 v3 Superconductivity

Authors: Fabio Deon , Vittorio Pellegrini , Francesco Giazotto , Giorgio Biasiol , Lucia Sorba , Fabio Beltram

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Abstract

We report the realization of a hybrid superconductor-quantum dot device by means of top-down nanofabrication starting from a two dimensional electron gas in a InGaAs/InAlAs semiconductor heterostructure. The quantum dot is defined by electrostatic gates placed within the normal region of a planar Nb-InGaAs quantum well-Nb junction. Measurements in the regime of strong Coulomb blockade as well as cotunneling spectroscopy allow to directly probe the proximity-induced energy gap in a ballistic two-dimensional electron gas coupled to superconductors.

Keywords

quantum dot proximity-induced superconductivity two-dimensional electron gas coulomb blockade cotunneling spectroscopy nb-ingaas junction

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@article{arxiv.1012.4394,
  title  = {Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas},
  author = {Fabio Deon and Vittorio Pellegrini and Francesco Giazotto and Giorgio Biasiol and Lucia Sorba and Fabio Beltram},
  journal= {arXiv preprint arXiv:1012.4394},
  year   = {2011}
}

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4 pages, 3 figures

Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas

Abstract

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