Fast trimers in one-dimensional extended Fermi-Hubbard model

TL;DR

This paper investigates the stability, detection, and dynamics of trimers in a one-dimensional extended Fermi-Hubbard model with mass imbalance, revealing rapid propagation of trimers and proposing experimental relevance.

Contribution

It introduces a generalized trimer gap definition and analyzes the unique expansion dynamics of trimers in the extended Fermi-Hubbard model.

Findings

Rapidly propagating trimers with speeds exceeding doublons

Generalized trimer gap including various cluster formations

Potential for experimental observation of trimer dynamics

Abstract

We consider a one-dimensional two component extended Fermi-Hubbard model with nearest neighbor interactions and mass imbalance between the two species. We study the stability of trimers, various observables for detecting them, and expansion dynamics. We generalize the definition of the trimer gap to include the formation of different types of clusters originating from nearest neighbor interactions. Expansion dynamics reveal rapidly propagating trimers, with speeds exceeding doublon propagation in strongly interacting regime. We present a simple model for understanding this unique feature of the movement of the trimers, and we discuss the potential for experimental realization.