Controlled generation of coherent matter-currents using a periodic driving field

TL;DR

This paper demonstrates how a strong oscillating field can be used to generate and control stable, coherent matter currents in ultracold bosonic systems within optical lattices, using Floquet theory for analysis.

Contribution

It introduces a method to control atomic currents in optical lattices via periodic driving, providing a stable and precise approach for quantum system manipulation.

Findings

Controlled atomic currents achieved with periodic driving

Floquet theory used to analyze system stability

Method enables precise quantum system control

Abstract

We study the effect of a strong, oscillating driving field on the dynamics of ultracold bosons held in an optical lattice. Modeling the system as a Bose-Hubbard model, we show how the driving field can be used to produce and maintain a coherent atomic current by controlling the phase of the intersite tunneling processes. We investigate both the stroboscopic and time-averaged behavior using Floquet theory, and demonstrate that this procedure provides a stable and precise method of controlling coherent quantum systems.