Intercomponent correlations in attractive one-dimensional mass-imbalanced few-body mixtures

TL;DR

This paper investigates how mass imbalance affects inter-component correlations in few-body one-dimensional ultra-cold atomic mixtures, revealing significant changes in correlation properties and ground state structure.

Contribution

It provides a detailed analysis of correlation noise in mass-imbalanced mixtures, highlighting the role of quantum statistics and the transition from pair-like to uncorrelated states.

Findings

Correlation properties vary with mass ratio

Ground state structure changes significantly

Quantum statistics influence correlation behavior

Abstract

Ground-state properties of a few attractively interacting ultra-cold atoms of different mass confined in a one-dimensional harmonic trap are studied in terms of the correlation noise. Depending on the mass ratio between the components' atoms, the inter-particle correlations change their properties significantly from a strong pair-like correlation to an almost uncorrelated phase. This change is accompanied by the undergoing change in the structure of the many-body ground state. A crucial role of the quantum statistics is emphasized by comparing properties of the Fermi-Fermi mixture with a corresponding Fermi-Bose system.