3 papers
cond-mat.quant-gas2026
Quasi-particle residue and charge of the one-dimensional Fermi polaron
Giuliano Orso, Lovro BariÅ¡iÄ, Ekaterina Gradova +2
We consider a mobile impurity coupled to an ideal Fermi gas in one spatial dimension through an attractive contact interaction. We calculate the quasi-particle residue exactly,…
cond-mat.str-el2025
On polarons and dimerons in the two-dimensional attractive Hubbard model
Gerard Pascual, Jordi Boronat, Kris Van Houcke
A two-dimensional spin-up ideal Fermi gas interacting attractively with a spin-down impurity in the continuum undergoes, at zero temperature, a first-order phase transition from a…
cond-mat.quant-gas2025
Downfolding a quantum many-body system: the quasi-1D Fermi polaron
Lovro Anto BariÅ¡iÄ, Giuliano Orso, Frédéric Chevy +1
We investigate the properties of an impurity immersed in an ensemble of spin-polarized fermions confined in a tight quantum wire. We use a non-perturbative variational approach tha…