Mottness: Identifying the Propagating Charge Modes in doped Mott Insulators

TL;DR

This paper reviews how experimental evidence and recent theoretical advances identify the weakly interacting charge modes in doped Mott insulators, shedding light on the normal state properties of high-temperature cuprate superconductors.

Contribution

It introduces a theoretical framework that pinpoints the propagating charge modes in doped Mott insulators, explaining various normal state phenomena in cuprates.

Findings

Identification of weakly interacting charge modes in doped Mott insulators.

Explanation of pseudogap and mid-infrared band phenomena.

Understanding of T-linear resistivity in cuprates.

Abstract

High-temperature superconductivity in the copper-oxide ceramics remains an unsolved problem because we do not know what the propagating degrees of freedom are in the normal state. As a result, we do not know what are the weakly interacting degrees of freedom which pair up to form the superconducting condensate. That the electrons are not the propagating degrees of freedom in the cuprates is seen most directly from experiments that show spectral weight redistributions over all energy scales. Of course, the actual propagating degrees of freedom minimize such spectral rearrangements. This review focuses on the range of epxerimental consequences such UV-IR mixings have on the normal state of the cuprates, such as the pseudogap, mid-infrared band, temperature dependence of the Hall number, the superfluid density, and a recent theoretical advance which permits the identification of the weakly interacting degrees of freedom in a doped Mott insulator. Within this theory, we show how the wide range of phenomena which typify the normal state of the cuprates arises including $T-$linear resistivity.