Laser-controlled local magnetic field with semiconductor quantum rings

TL;DR

This paper presents a theoretical study of how phase-locked laser pulses can manipulate electron angular momentum in semiconductor quantum rings, generating local magnetic fields for quantum control applications.

Contribution

It introduces a method to control electron angular momentum and magnetic fields in quantum rings using laser pulse sequences, enabling targeted spin manipulation.

Findings

Laser pulses can induce strong currents in quantum rings.

Controlled angular momentum states generate local magnetic fields.

Potential for selective spin control in quantum systems.

Abstract

We analize theoretically the dynamics of N electrons localized in a semiconductor quantum ring under a train of phase-locked infrared laser pulses. The pulse sequence is designed to control the total angular momentum of the electrons. The quantum ring can be put in states characterized by strong currents. The local magnetic field created by these currents can be used for a selective quantum control of single spins in semiconductor systems.