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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Anomalous Josephson current in junctions with spin polarizing quantum point contacts.

A A Reynoso¹, Gonzalo Usaj, C A Balseiro

¹Instituto Balseiro, Centro Atómico Bariloche, Río Negro, Argentina.

Physical Review Letters

|October 15, 2008

Summary

We found an anomalous supercurrent in Josephson junctions due to spin-orbit coupling and magnetic fields. This effect leads to current rectification, enabling new possibilities for superconducting electronics.

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Area of Science:

Condensed matter physics
Quantum electronics

Background:

Ballistic Josephson junctions are crucial for quantum electronics.
Rashba spin-orbit coupling in two-dimensional electron gases influences spin properties.
Quantum point contacts can act as spin filters in electronic circuits.

Purpose of the Study:

To investigate the behavior of a ballistic Josephson junction with a quantum point contact in a two-dimensional electron gas featuring Rashba spin-orbit coupling.
To explore the effects of an in-plane external magnetic field on the supercurrent properties of such a system.

Main Methods:

Theoretical modeling of a Josephson junction incorporating a quantum point contact with Rashba spin-orbit coupling.
Analysis of supercurrent behavior under an applied in-plane magnetic field.

Main Results:

An anomalous supercurrent was observed even at zero phase difference between superconducting electrodes.
The external magnetic field induced significant critical current asymmetries for different current flow directions.
Supercurrent rectification effects were demonstrated.

Conclusions:

The interplay of Rashba spin-orbit coupling and magnetic fields in Josephson junctions can lead to novel phenomena like anomalous supercurrents.
The observed critical current asymmetries and rectification effects offer potential for spintronic and quantum computing applications.