Orbital physics of polar Fermi molecules

TL;DR

This paper investigates the complex behavior of polar dipolar fermions in a 2D optical lattice, emphasizing the importance of a multi-band Fermi-Hubbard model to predict novel phases arising from intricate interactions.

Contribution

It introduces a comprehensive multi-band Fermi-Hubbard model accounting for various interactions and tunneling, revealing new phases in strongly-interacting polar Fermi systems.

Findings

Multi-band interactions are crucial for accurate modeling.

Novel phases emerge in the strongly-interacting regime.

Occupation-dependent tunneling influences phase behavior.

Abstract

We study a system of polar dipolar fermions in a two-dimensional optical lattice and show that multi-band Fermi-Hubbard model is necessary to discuss such system. By taking into account both on-site, and long-range interactions between different bands, as well as occupation-dependent inter- and intra-band tunneling, we predict appearance of novel phases in the strongly-interacting limit.