Kinetic formation of trimers and multimers in a spinless fermionic chain

Lorenzo Gotta (1) , Leonardo Mazza (1) , Pascal Simon (2) , Guillaume Roux (1)

1 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques
2 LPS - Laboratoire de Physique des Solides

We study a chain of spinless fermions with a multimer hopping term which kinematically favors the formation of multimers and competes with single-particle hopping. We argue that this model generically stabilizes two different multimer phases, as well as intermediate phases where the free-fermion and multimer fluids coexist and do not spatially separate. Using density-matrix renormalization group techniques, we establish the phase diagram of the model in the case of trimers. For one of the intermediate phases, hybridization between the fermions and trimers liquids does occur and the onset of their correlations is well captured by a generalized BCS-like ansatz. The case of tetramers is finally addressed.

Domaines: Matière Condensée [cond-mat]

Lorenzo Gotta, Leonardo Mazza, Pascal Simon, Guillaume Roux. Kinetic formation of trimers and multimers in a spinless fermionic chain. Physical Review B, 2022, 105 (13), pp.134512. ⟨10.1103/PhysRevB.105.134512⟩. ⟨hal-03467325⟩