Dynamics of one-dimensional quantum many-body systems in time-periodic linear potentials

TL;DR

This paper investigates the dynamics of one-dimensional quantum many-body systems under time-periodic linear potentials, deriving the Floquet Hamiltonian and analyzing the system's behavior at both micro and macro scales, including cases with acceleration.

Contribution

It extends the analysis of driven quantum systems to many-body cases with interactions, showing the Floquet Hamiltonian remains integrable when the undriven model is integrable, and provides explicit expressions for the time-evolved states.

Findings

Floquet Hamiltonian preserves integrability in certain cases

Derived explicit micro-motion operator and state evolution

Analyzed center of mass motion and spreading over time

Abstract

We study a system of one-dimensional interacting quantum particles subjected to a time-periodic potential linear in space. After discussing the cases of driven one- and two-particles systems, we derive the analogous results for the many-particles case in presence of a general interaction two-body potential and the corresponding Floquet Hamiltonian. When the undriven model is integrable, the Floquet Hamitlonian is shown to be integrable too. We determine the micro-motion operator and the expression for a generic time evolved state of the system. We discuss various aspects of the dynamics of the system both at stroboscopic and intermediate times, in particular the motion of the center of mass of a generic wavepacket and its spreading over time. We also discuss the case of accelerated motion of the center of mass, obtained when the integral of the coeffcient strenght of the linear potential on a time period is non-vanishing, and we show that the Floquet Hamiltonian gets in this case an additional static linear potential. We also discuss the application of the obtained results to the Lieb-Liniger model.