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

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.

4 pages, 3 figures

References in corpus (13)

• Supercurrent reversal in quantum dots
• A Quantum Dot in the Kondo Regime Coupled to Superconductors
• Phase controlled superconducting proximity effect probed by tunneling spectroscopy
• Resonant tunneling through a small quantum dot coupled to superconducting leads
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• Hybrid superconductor-semiconductor devices made from self-assembled SiGe nanocrystals on silicon
• Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
• Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
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• Magneto-transport in high g-factor, low-density two-dimensional electron systems confined in In_0.75Ga_0.25As/In_0.75Al_0.25As quantum wells
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• Singlet-triplet transition in a few-electron lateral InGaAs-InAlAs quantum dot

Cited by in corpus (11)

• Quantized conductance doubling and hard gap in a two-dimensional semiconductor-superconductor heterostructure
• Electron-hole pairing in graphene-GaAs heterostructures
• Majorana bound states in hybrid 2D Josephson junctions with ferromagnetic insulators
• Proximity effect in a two dimensional electron gas probed with a lateral quantum dot
• Nb/InAs nanowire proximity junctions from Josephson to quantum dot regimes
• Hybrid normal-superconducting Aharonov-Bohm quantum thermal device
• A ballistic quantum ring Josephson interferometer
• Anomalous electromagnetic response of superconducting Rashba systems in trivial and topological phases
• Majorana states and devices in magnetic structures
• Effective Long-Range Pairing and Hopping in Topological Nanowires Weakly Coupled to $s$-Wave Superconductors
• Equilibrium circular photogalvanic effect in a hybrid superconductor-semiconductor system