Non-adiabatic Current Excitation in Quantum Rings

TL;DR

This paper explores how strong, short-lived THz perturbations non-adiabatically alter persistent currents in one-dimensional and finite-width quantum rings through different mechanisms.

Contribution

It provides a comparative analysis of non-adiabatic current excitation mechanisms in 1D and finite-width quantum rings under THz perturbations.

Findings

Persistent current is modified via non-adiabatic state changes.

Different mechanisms govern the response in 1D and finite-width rings.

The study advances understanding of ultrafast control of quantum ring currents.

Abstract

We investigate the difference in the response of a one-dimensional semiconductor quantum ring and a finite-width ring to a strong and short-lived time-dependent perturbation in the THz regime. In both cases the persistent current is modified through a nonadiabatic change of the many-electron states of the system, but by different mechanisms in each case.