Filling dependence of a new type of charge ordered liquid on a triangular lattice system

TL;DR

This paper investigates a novel gapless charge ordered state in a spinless fermion system on a triangular lattice, revealing a stable coexistence of solid and liquid charge components over a broad filling range.

Contribution

It introduces a new type of charge ordered liquid state with a filling-dependent structure on a triangular lattice, expanding understanding of charge order phenomena.

Findings

Charge ordered liquid state is stable for 1/3<n<2/3.

Charges form a Wigner crystal and a mobile liquid component.

The state exhibits filling-dependent properties.

Abstract

We study the recently reported characteristic gapless charge ordered state in a spinless fermion system on a triangular lattice under strong inter-site Coulomb interactions. In this state the charges are spontaneously divided into solid and liquid component, and the former solid part aligns in a Wigner crystal manner while the latter moves among them like a pinball. We show that such charge ordered liquid is stable over a wide range of filling, $1/3<n<2/3$, and examine its filling dependent nature.