Persistent Currents in the Presence of a Transport Current

TL;DR

This paper demonstrates that persistent currents can flow in a metallic ring without magnetic fields due to quantum effects related to current magnification, observable under specific electronic conditions.

Contribution

It reveals a novel quantum phenomenon where persistent currents occur without magnetic flux, linked to current magnification in coupled metallic rings.

Findings

Persistent currents can flow without magnetic field.

Observation depends on tuning Fermi energy near antiresonances.

Quantum effects enable current magnification in the system.

Abstract

We have considered a system of a metallic ring coupled to two electron reservoirs. We show that in the presence of a transport current, the persistent current can flow in a ring, even in the absence of magnetic field. This is purely a quantum effect and is related to the current magnification in the loop. These persistent currents can be observed if one tunes the Fermi energy near the antiresonances of the total transmission coefficient or the two port conductance.