Pair scattering from time-modulated impurity in the Bose-Hubbard model

TL;DR

This paper studies how a time-modulated impurity affects particle and pair transport in a one-dimensional Bose-Hubbard model, revealing phenomena like pair dissociation and Floquet BICs with implications for quantum control.

Contribution

It provides the first detailed analysis of pair scattering and localization effects in a driven Bose-Hubbard system with a time-periodic impurity, combining exact numerics and analytical predictions.

Findings

Excellent agreement between numerical and analytical results at high frequency.

Observation of pair dissociation and localized single-particle modes.

Identification of Floquet Bound States in the Continuum (BICs).

Abstract

We investigate scattering phenomena in a one-dimensional attractive Bose-Hubbard model with a time-periodically modulated impurity. We analyze both single-particle and pair (doublon) transmission, exploring a range of interaction strengths and drive amplitudes. Our exact numerical results reveal excellent quantitative agreement with analytical predictions in the high-frequency limit. At intermediate and weak attractive interactions, we observe significant pair dissociation and the emergence of dynamically localized single-particle modes. These features are reminiscent of Floquet Bound States in the Continuum (BICs). These findings provide new avenues for engineering controllable quantum transport and localized states in ultracold atom experiments.