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

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

2010-12-20

arxiv.org/abs/1012.4394v3

Applied Physics Letters 98, 132101 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1063/1.3570660

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.

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