Work

Phase diagram and elementary excitations of strongly interacting droplets with non-local interactions

Year: 2025

Type: article

Abstract: A one-dimensional bosonic gas with strong contact repulsion and attractive non-local interactions may form a quantum droplet with a flat-top density profile. We focus on a system in the Tonks–Girardeau limit of infinitely strong contact repulsion. We show that the main system features are the same for a broad class of non-local interaction potentials. Then, we focus on a limiting case, the one of slowly varying density profiles, to find approximate formulas for the surface and bulk energies of a droplet. We further characterise the system by numerically finding the excitation spectrum. It consists of two families: phononic-like excitations inside droplets and scattering modes. Analysis within the linearised regime is supplemented with the full, nonlinear dynamics of small perturbations.

Source: Journal of Physics B Atomic Molecular and Optical Physics

DOI: 10.1088/1361-6455/adba9d

Authors: Maciej Łebek, Jakub Kopyciński, Wojciech Górecki, Rafał Ołdziejewski, Krzysztof Pawłowski

Institutions: Center for Theoretical Physics, University of Warsaw, Polish Academy of Sciences, Max Planck Institute of Quantum Optics

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,325

Funders: Fundacja na rzecz Nauki Polskiej, Narodowe Centrum Nauki