# Many-Body Quantum Dynamics of a Bosonic Josephson Junction with a Finite-Range Interaction

## TL;DR

This paper investigates how finite-range interactions influence the out-of-equilibrium quantum dynamics of a Bose gas in a double well, revealing that interaction range affects system behavior differently in each well and requires many-body theory for accurate description.

## Contribution

It provides a detailed numerical analysis of finite-range interaction effects on Bose gas dynamics in a double well, highlighting the necessity of many-body approaches like MCTDHB.

## Key findings

- Interaction range impacts dynamics differently in each well.
- Finite-range effects are significant even in the infinite-particle limit.
- Many-body theory is essential to accurately describe the system.

## Abstract

The out-of-equilibrium quantum dynamics of a Bose gas trapped in an asymmetric double well and interacting with a finite-range interaction has been studied in real space by solving the time-dependent many-body Schr\"odinger equation numerically accurately using the multiconfigurational time-dependent Hartree method for bosons (MCTDHB). We have focused on the weakly interacting limit where the system is essentially condensed. We have examined the impact of the range of the interaction on the dynamics of the system, both at the mean-field and many-body levels. Explicitly, we have studied the maximal and the minimal values of the many-body position variance in each cycle of oscillation, and the overall pace of its growth. We find that the range of the interaction affects the dynamics of the system differently for the right well and the left well. We have also examined the infinite-particle limit and find that even there, the impact of the range of the interaction can only be described by a many-body theory such as MCTDHB.