Modulation stabilization of Bloch oscillations of two-component Bose-Einstein condensates in optical lattices

TL;DR

This paper investigates how to control and stabilize Bloch oscillations in two-component Bose-Einstein condensates within optical lattices by modulating interactions and lattice configurations, aiming for long-lasting oscillations.

Contribution

It introduces a method to suppress damping of Bloch oscillations through synchronized harmonic modulation of atom-atom interactions and lattice configurations.

Findings

Harmonic modulation can fully suppress damping of BOs.

Inverse sign interactions enable long-living and revival BOs.

Guidance for experimental realization of stable BOs in BECs.

Abstract

We study the Bloch oscillations (BOs) of two-component Bose-Einstein condensates (BECs) trapped in spin-dependent optical lattices. Based on the derived equations of motion of the wave packet in the basis of localized wave functions of the lattice sites, the damping effect induced by the intercomponent and intracomponent interactions to the BOs is explored analytically and numerically. We also show that such damping of the BOs can be suppressed entirely if all the atom-atom interactions are modulated synchronously and harmonically in time with suitable frequency via the Feshbach resonance. When the intercomponent and the intracomponent interactions have inverse signs, we find that the long-living BOs and even the revival of the BOs can be achieved via only statically modulating the configuration of optical lattices. The results provide a valuable guidance for achieving long-living BOs in the two-component BEC system by the Feshbach resonances and manipulating the configuration of the optical lattices.