Impurity immersed in a two-component few-fermion mixture in a one-dimensional harmonic trap
Phys. Rev. A 113, 013301 – Published 2 January, 2026
DOI: https://doi.org/10.1103/wgrg-q22s
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 find that this transition exhibits unique universality features not observed in other systems, highlighting novel many-body properties existing in multicomponent fermionic mixtures.
