Influence of the impurity on formation of pair correlations in ultra-cold few-fermion systems

In our work, we study the influence of interactions of two-component mixture containing several fermions with a third-component particle (impurity) [1]. Particularly, we focus on the problem of formation of Cooper-like correlations in the mixture. We assume that components A and B interact with attractive forces, and therefore they host Cooper-like pairing in their many-body ground state |G⟩ [2,3]. The intensity of these pairing correlations is quantified via two-particle correlation function in momentum domain. We investigate how these correlations are interfered by a symmetric interaction with the third component particle (g=g_AC=g_BC). We show that, while attractions with the third component always disrupt Cooper-pair precursors, small repulsion may actually enhance the pairing process.

[1] M. Teske, T. Sowiński, Phys. Rev. A 113, 013301 (2026)
[2] T. Sowiński, EPL 134, 33001 (2021)
[3] D. Pęcak, T. Sowiński, Phys. Rev. Res. 2, 012077(R) (2020)

Date: 22 May, 12:15 PM CET
Location: room D at Al. Lotników, also available on Zoom

Zoom link:
https://us06web.zoom.us/j/87057373249?pwd=MNnyk4rUf9cOVZoxeqIaKkhwYk5STm.1