Externally controlled local magnetic field in a conducting mesoscopic ring coupled to a quantum wire

TL;DR

This paper theoretically demonstrates how an external electric field can control the magnetic field generated by a circulating current in a quantum ring coupled to a wire, enabling tunable magnetic fields for quantum device applications.

Contribution

It introduces a method to externally regulate local magnetic fields in a quantum ring via electric fields, advancing control in spin-based quantum devices.

Findings

Magnetic field at the ring's center can be tuned by electric field regulation.

A circulating current is established under finite bias voltage.

The system's potential for designing spin-based quantum devices is confirmed.

Abstract

In the present work the possibility of regulating local magnetic field in a quantum ring is investigated theoretically. The ring is coupled to a quantum wire and subjected to an in-plane electric field. Under a finite bias voltage across the wire a net circulating current is established in the ring which produces a strong magnetic field at its centre. This magnetic field can be tuned externally in a wide range by regulating the in-plane electric field, and thus, our present system can be utilized to control magnetic field at a specific region. The feasibility of this quantum system in designing spin-based quantum devices is also analyzed.