Proximity effect in a two dimensional electron gas probed with a lateral quantum dot

Abstract

We report low-temperature transport measurements performed on a planar Nb-InGaAs-Nb proximity Josephson junction hosting a gate-defined lateral quantum dot in the weak-link. We first study quasiparticle and Josephson transport through the open junction, when all gates are grounded. When the quantum dot is defined in the normal region by electrostatic depletion, cotunneling spectroscopy allows us to directly probe the energy gap induced in the two dimensional electron gas. Our data show good qualitative agreement with a model describing resonant tunneling through an Anderson impurity connected to superconducting electrodes. These results demonstrate the feasibility of top-gated nanodevices based on a two-dimensional electron gas coupled to a superconductor.

5 pages, 5 figures

References in corpus (5)

• Majorana fermions in a tunable semiconductor device
• Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots
• Switching the sign of Josephson current through Aharonov-Bohm interferometry
• Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas
• Origin of Hysteresis in a Proximity Josephson Junction

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• The $\omega$-SQUIPT: phase-engineering of Josephson topological materials
• Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device
• Electrostatic tailoring of magnetic interference in quantum point contact ballistic Josephson junctions
• Phase-coherent heat circulator based on multi-terminal Josephson junctions
• Majorana bound states in hybrid 2D Josephson junctions with ferromagnetic insulators
• Josephson coupling through one-dimensional ballistic channel in semiconductor-superconductor hybrid quantum point contacts
• Hybrid normal-superconducting Aharonov-Bohm quantum thermal device
• A ballistic quantum ring Josephson interferometer
• A ballistic two-dimensional-electron-gas Andreev interferometer
• Thermally induced subgap features in the cotunneling spectroscopy of a carbon nanotube
• Investigation of InAs based devices for topological applications