Impurity immersed in a two-component few-fermion mixture in a one-dimensional harmonic trap
Abstract
We investigate a one-dimensional three-component few-fermion mixture confined in a parabolic external trap, where one component contains a single particle acting as an impurity. Focusing on the many-body ground state, we analyze how the interactions between the impurity and the other components influence the system's structure. For fixed interaction strengths within the mixture, we identify a critical interaction strength with the impurity for which the system undergoes a structural transition characterized by a substantial change in its spatial features. We explore this transition from the point of view of correlations and ground-state susceptibility. We remarkably find that this transition exhibits unique universality features not previously observed in other systems, highlighting novel many-body properties existing in multi-component fermionic mixtures.
Cite
@article{arxiv.2507.01625,
title = {Impurity immersed in a two-component few-fermion mixture in a one-dimensional harmonic trap},
author = {Marek Teske and Tomasz Sowiński},
journal= {arXiv preprint arXiv:2507.01625},
year = {2026}
}
Comments
Authors' version accepted for publication