Mixtures of attractive heavy and light particles are particularly interesting because the light particles behave as a glue binding the heavy particles and leading to heavy-light particle clusters. Close to an s-wave resonance between the light and heavy particles, the clusters can become halo states with universal properties. A famous example is the Efimov states of two heavy particles and one light particle [1]. Another possibility is the universal halo states of two heavy polarised fermions and a light particle predicted by Kartavtsev and Malykh [2].
In this talk, I will discuss the properties of such universal clusters and how they are affected by the presence of interaction in the p-wave channel [3].
[1] P. N. and S. Endo, “Efimov physics: a review.” Rep. Prog. Phys. 80 056001 (2017).
[2] O. I. Kartavtsev and A. V. Malykh, “Low-energy three-body dynamics in binary quantum gases.” J. Phys B 40, 1429 (2007).
[3] P. N., L. Pricoupenko, C. Schmickler “Shallow Trimers of Two Identical Fermions and One Particle in Resonant Regimes” SciPost Phys. 12, 185 (2022).
