A ballistic quantum ring Josephson interferometer

Abstract

We report the realization of a ballistic Josephson interferometer. The interferometer is made by a quantum ring etched in a nanofabricated two-dimensional electron gas confined in an InAs-based heterostructure laterally contacted to superconducting niobium leads. The Josephson current flowing through the structure shows oscillations with h/e flux periodicity when threading the loop with a perpendicular magnetic field. This periodicity, in sharp contrast with the h/2e one observed in conventional dc superconducting quantum interference devices, confirms the ballistic nature of the device in agreement with theoretical predictions. This system paves the way for the implementation of interferometric Josephson pi-junctions, and for the investigation of Majorana fermions.

4+ pages, 4 colored figures

References in corpus (7)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• The Josephson heat interferometer
• Signatures of topological phase transitions in mesoscopic superconducting rings
• Electrostatic tailoring of magnetic interference in quantum point contact ballistic Josephson junctions
• Quantum dot spectroscopy of proximity-induced superconductivity in a two-dimensional electron gas
• Origin of Hysteresis in a Proximity Josephson Junction

Cited by in corpus (11)

• Magnetically-driven colossal supercurrent enhancement in InAs nanowire Josephson junctions
• Pb/InAs nanowire Josephson junction with high critical current and magnetic flux focusing
• Quantum Hall Effect in a Josephson Junction
• Phase-coherent heat circulator based on multi-terminal Josephson junctions
• Majorana bound states in hybrid 2D Josephson junctions with ferromagnetic insulators
• Full electrostatic control of quantum interference in an extended trenched Josephson junction
• Hybrid normal-superconducting Aharonov-Bohm quantum thermal device
• Electrostatical formation of the Majorana quasiparticles in the quantum dot--nanoring structure
• A ballistic two-dimensional-electron-gas Andreev interferometer
• Majorana states and devices in magnetic structures
• InAs on Insulator: A New Platform for Cryogenic Hybrid Superconducting Electronics