Mott Transition in the Two-Dimensional Hubbard Model

TL;DR

This paper investigates the spectral properties of the 2D Hubbard model near the Mott transition, revealing how charge freezing leads to magnetic excitations and explaining anomalous features in high-temperature superconductors.

Contribution

It provides a unified explanation of spectral features near the Mott transition using cluster perturbation theory.

Findings

Charge degrees of freedom freeze at the transition

Spectral features explain high-Tc superconductor anomalies

Continuous transition from metallic to insulating state

Abstract

Spectral properties of the two-dimensional Hubbard model near the Mott transition are investigated by using cluster perturbation theory. The Mott transition is characterized by freezing of the charge degrees of freedom in a single-particle excitation that leads continuously to the magnetic excitation of the Mott insulator. Various anomalous spectral features observed in high-temperature superconductors are explained in a unified manner as properties near the Mott transition.