Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3570660
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Funding
- E.U. [FP6-517567]
- MIUR-FIRB [RBIN06JB4C]
- INFM-CNR
- NanoSciERA project NanoFridge
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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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3570660]
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