Phase Diagram of Spinless Fermions on an Anisotropic Triangular Lattice at Half-filling

TL;DR

This paper explores the phase diagram of spinless fermions on an anisotropic triangular lattice at half-filling, revealing unconventional charge-ordered phases driven by quantum effects and their temperature-dependent behaviors.

Contribution

It uncovers novel charge-ordered phases, such as the pinball liquid and striped chains, induced by quantum dynamics in a strongly correlated system.

Findings

Identification of pinball liquid and striped chain phases

Quantum effects induce unconventional charge order

Finite temperature effects revive disorder in organic materials

Abstract

The strong coupling phase diagram of the spinless fermions on the anisotropic triangular lattice at half-filling is presented. The geometry of inter-site Coulomb interactions rules the phase diagram. Unconventional charge ordered phases are detected which are the recently reported pinball liquid and the striped chains. Both are induced by the quantum dynamics out of classical disordered states and afford extremely correlated metallic states and the particular domain wall-type of excitations, respectively. The disorder once killed by the quantum effect revives at the finite temperature, which is discussed in the terms of the organic $\theta$-ET$_2X$.