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EnglishWe 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.
http://hdl.handle.net/11384/6450| Titolo: | Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas |
| Autori interni: | BELTRAM, Fabio |
| Data di pubblicazione: | 2011 |
| Rivista: | APPLIED PHYSICS LETTERS |
| 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. |
| Handle: | http://hdl.handle.net/11384/6450 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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