Solitons in the Crossover between Band Insulator and Mott Insulator: Application to TTF-Chloranil under Pressure

TL;DR

This paper investigates solitons in a one-dimensional system transitioning between band and Mott insulators, revealing fractional charges and spins, and aligns theoretical findings with experimental observations in TTF-Chloranil under pressure.

Contribution

It identifies two types of solitons with fractional charges and spins in the crossover region, providing a theoretical explanation consistent with experimental data.

Findings

Two types of solitons with fractional charges and different spins are found.

Theoretical results agree with experimental observations in TTF-Chloranil under pressure.

Solitons are characterized within the phase Hamiltonian framework.

Abstract

Based on the Phase Hamiltonian, two types of solitons are found to exist in the crossover region between band insulator and Mott insulator in one-dimension. Both of these solitons have fractional charges but with different spins, zero and 1/2, respectively. The results are in accord with the experimental results by Kanoda et al. for TTF-Chloranil under pressure.