Coulomb blockade in open superconducting islands on InAs nanowires

Abstract

Electrons in closed systems can exhibit Coulomb blockade (CB) oscillations due to charge quantization. Here, we report CB oscillations in aluminum superconducting islands on InAs nanowires in the open regime. The Al island is connected to the source/drain leads through two contacts: One is fully transmitting while the other is tuned into the tunneling regime. This device configuration is typical for tunneling spectroscopy where charging energy is generally considered negligible. The oscillation periods are 2$e$ or 1$e$, depending on the gate settings. A magnetic field can induce the 2$e$ to 1$e$ transition. Our result is reminiscent of the "mesoscopic Coulomb blockade" in open quantum dots caused by electron interference.

References in corpus (10)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Realization of a minimal Kitaev chain in coupled quantum dots
• InAs-Al Hybrid Devices Passing the Topological Gap Protocol
• Plateau regions for zero-bias peaks within 5% of the quantized conductance value $2e^2/h$
• Large zero bias peaks and dips in a four-terminal thin InAs-Al nanowire device
• In Situ Epitaxy of Pure Phase Ultra-Thin InAs-Al Nanowires for Quantum Devices
• Suppressing Andreev bound state zero bias peaks using a strongly dissipative lead
• Large Andreev bound state zero bias peaks in a weakly dissipative environment