Lateral electron tunneling through single self-assembled InAs quantum dots coupled to superconducting nanogap electrodes

Abstract

We have fabricated superconductor-quantum dot-superconductor (SC-QD-SC) junctions by using SC aluminum electrodes with narrow gaps laterally contacting a single self-assembled InAs QD. The fabricated junctions exhibited clear Coulomb staircases and Coulomb oscillations at 40 mK. Furthermore, clear suppression in conductance was observed for the source-drain voltage $|V_{\mathrm{SD}}|<2\Delta /e$, where $\Delta$ is the SC energy gap of Al. The absence of Josephson current that flows through QDs is due to the strong Coulomb interaction and non-negligible thermal fluctuation in our measurement system.

References in corpus (8)

• Supercurrent reversal in quantum dots
• Quantum supercurrent transistors in carbon nanotubes
• Electron Cotunneling in a Semiconductor Quantum Dot
• Multiple Andreev Reflections in a Carbon Nanotube Quantum Dot
• Resonant tunneling through a small quantum dot coupled to superconducting leads
• Spin transport through a single self-assembled InAs quantum dot with ferromagnetic leads
• Electric-field control of tunneling magnetoresistance effect in a Ni/InAs/Ni quantum-dot spin valve
• Single-dot spectroscopy via elastic single-electron tunneling through a pair of coupled quantum dots

Cited by in corpus (5)

• Electrical control of Kondo effect and superconducting transport in a side-gated InAs quantum dot Josephson junction
• Andreev reflection versus Coulomb blockade in hybrid semiconductor nanowire devices
• Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas
• Supergap anomalies in cotunneling between N-S and between S-S leads via a small quantum dot
• π junction transition in InAs self-assembled quantum dot coupled with SQUID