Inhomogeneity in doped Mott insulator

TL;DR

This paper classifies Mott insulators into two types based on their response to doping, highlighting the role of inhomogeneity in cuprate superconductors and proposing a new conceptual framework.

Contribution

It introduces a novel classification of Mott insulators into two generic types based on doping response and discusses their implications for cuprate physics.

Findings

Type I Mott insulators form inhomogeneous charge clusters upon doping.

Type II Mott insulators exhibit homogeneous charge distribution when doped.

Inhomogeneity plays a significant role in the behavior of cuprate superconductors.

Abstract

We introduce the concept that there are two generic classes of Mott insulators in nature. They are distinguished by their responses to weak doping. Doped charges form cluster (i.e. distribute inhomogeneously) in type I Mott insulators while distribute homogeneously in type II Mott insulators. We present our opinion on the role inhomogeneity plays in the cuprates.