Dimerization in a half-filled one-dimensional extended Hubbard model

TL;DR

This paper uses the density matrix renormalization group method to map the phase diagram of a half-filled one-dimensional extended Hubbard model, revealing a narrow bond-order-wave phase and accurately locating the tricritical point.

Contribution

It provides a precise determination of the phase boundaries and the existence of a controversial bond-order-wave phase in the model.

Findings

Identification of a narrow bond-order-wave phase

Accurate location of the tricritical point at U_t≈7.2t and V_t≈3.746t

Clarification of the phase diagram structure

Abstract

We use a density matrix renormalization group method to study quantitatively the phase diagram of a one-dimensional extended Hubbard model at half-filling by investigating the correlation functions and structure factors. We confirm the existence of a novel narrow region with long-rang bond-order-wave order which is highly controversial recently between the charge-density-wave phase and Mott insulator phase. We determined accurately the position of the tricritical point $U_t\simeq 7.2t$, $V_t\simeq 3.746t$ which is quite different from previous studies.