Dynamics and transport of Bose-Einstein condensates in bent potentials

TL;DR

This paper explores how the geometry of bent potentials can control the quantum transport and tunneling behavior of Bose-Einstein condensates, revealing tunable transport properties through curvature adjustments.

Contribution

It demonstrates that geometry alone can serve as a precise control mechanism for bosonic tunneling dynamics in two-dimensional traps, combining simulations and analysis.

Findings

Bending induces a transition from localization to delocalization.

Weak curvature enables coherent tunneling; strong curvature suppresses transport.

Tunneling rates are precisely tunable via geometric parameters.

Abstract

The dynamics of bosons in curved geometries have recently attracted significant interest in quantum many-body physics. Leveraging recent experimental advances in tailored trapping landscapes, we investigate the quantum transport of weakly interacting bosons in two-dimensional bent trapping potentials, showing that geometry alone can serve as a precise control knob for tunneling dynamics. Using time-adaptive many-body simulations, complemented by mean-field analysis and exact diagonalization, we analyze both static and dynamical properties of bosons confined in the bent potential. We reveal how bending an initially straight channel induces a transition from density localization to delocalization and drives the buildup of correlations in the ground state. In the dynamics, the bent acts as a tunable barrier that enables controllable tunneling: weak curvature allows coherent tunnelling across the bend, while stronger bent suppresses transport and enhances self-trapping. The tunneling rate can be precisely tuned by geometric parameters, establishing bent traps as versatile platforms for geometry-controlled quantum transport.