@article{13278,
  abstract     = {We present a numerical analysis of spin-1/2 fermions in a one-dimensional harmonic potential in the presence of a magnetic point-like impurity at the center of the trap. The model represents a few-body analogue of a magnetic impurity in the vicinity of an s-wave superconductor. Already for a few particles we find a ground-state level crossing between sectors with different fermion parities. We interpret this crossing as a few-body precursor of a quantum phase transition, which occurs when the impurity "breaks" a Cooper pair. This picture is further corroborated by analyzing density-density correlations in momentum space. Finally, we discuss how the system may be realized with existing cold-atoms platforms.},
  author       = {Rammelmüller, Lukas and Huber, David and Čufar, Matija and Brand, Joachim and Hammer, Hans-Werner and Volosniev, Artem},
  issn         = {2542-4653},
  journal      = {SciPost Physics},
  keywords     = {General Physics and Astronomy},
  number       = {1},
  publisher    = {SciPost Foundation},
  title        = {{Magnetic impurity in a one-dimensional few-fermion system}},
  doi          = {10.21468/scipostphys.14.1.006},
  volume       = {14},
  year         = {2023},
}