Chaotic dynamics of Bose-Einstein condensates in a tilted optical lattice

TL;DR

This paper explores how combined AC and DC nonlinearities induce chaotic dynamics in Bose-Einstein condensates within tilted optical lattices, providing insights into controlling quantum states for technological applications.

Contribution

It introduces a systematic analysis of chaos emergence in BECs under combined AC and DC interactions, with numerical and analytical methods to distinguish regular and chaotic regimes.

Findings

Identification of different chaos types in BEC dynamics

Quantification of regular domain widths under varying parameters

Confirmation of chaos transition via Lyapunov exponents and Poincaré sections

Abstract

This study investigates the emergence of chaotic dynamics in Bose-Einstein condensates (BECs) subjected to both alternating (AC) and constant (DC) components of the interaction strength, modeled through the scattering length. We systematically explore how the interplay of AC and DC nonlinearities affect the dynamical evolution of the condensate under a tilted optical lattice potential. Various types of chaos are identified across different parametric regimes, with numerical simulations revealing a clear distinction between regular and chaotic domains. The width of the regular domains is quantified, and the influence of AC and DC components in promoting stochastic behavior is highlighted. Lyapunov exponents, Poincar\'e sections, and other chaos indicators then confirm the transition to chaotic dynamics, in agreement with analytical expectations. A qualitative conjecture is proposed for the role of these interactions in BEC stabilization. Our findings offer insights into the dynamic control of BECs, with potential applications in quantum simulation and coherent matter-wave engineering, in line with entanglement and quantum transport, that are crucial for developing robust and reliable quantum technologies.