Dynamically generating superflow in a bosonic ring via phase imprinting

TL;DR

This paper investigates how phase imprinting dynamically generates superflow in bosonic rings, revealing the underlying mechanisms and effects of system parameters through numerical simulations.

Contribution

It uncovers the microscopic processes of superflow formation via phase imprinting and analyzes the influence of interactions on this process.

Findings

Superflow is generated through density depletion caused by phase imprinting.

Quantized currents arise from azimuthal phase slips with density depletions.

Interactions suppress superflow formation by reducing density susceptibility.

Abstract

Phase imprinting enables the dynamic generation of superflow in bosonic atoms, effectively overcoming traditional limitations such as vortex number constraints and heating effects. However, the mechanisms underlying superflow formation remain insufficiently understood. In this work, we reveal these mechanisms by studying the time evolution of the transferred total angular momentum and the quantized current throughout the phase imprinting process, achieved through numerically solving the time-dependent Schr\"{o}dinger and Gross-Pitaevskii equations. We demonstrate that the Bose gas dynamically acquires angular momentum through the density depletion induced by the phase imprinting potential, whereas quantized currents emerge from azimuthal phase slips accompanied by complete density depletions. Regarding the impact of system parameters, such as interactions, we find that interactions hinder superflow formation, as the azimuthal density distribution becomes less susceptible to the phase imprinting potential. Our findings offer microscopic insights into the dynamic development of superflow during the phase imprinting process and provide valuable guidance for ongoing experimental efforts.