Spectral properties near the Mott transition in the two-dimensional Hubbard model with next-nearest-neighbor hopping

TL;DR

This paper investigates the spectral properties near the Mott transition in a 2D Hubbard model with next-nearest-neighbor hopping, explaining complex features observed in cuprate superconductors.

Contribution

It provides a simplified interpretation of spectral features caused by next-nearest-neighbor hopping and unifies the understanding of anomalous spectral features in doped cuprates.

Findings

Spectral weights are shifted by next-nearest-neighbor hopping.

Complex spectral features can be explained by simple shifts.

Unified explanation for anomalies in hole- and electron-doped cuprates.

Abstract

The single-particle spectral properties near the Mott transition in the two-dimensional Hubbard model with next-nearest-neighbor hopping are investigated by using cluster perturbation theory. Complicated spectral features of this model are simply interpreted, by considering how the next-nearest-neighbor hopping shifts the spectral weights of the two-dimensional Hubbard model. Various anomalous features observed in hole-doped and electron-doped cuprate high-temperature superconductors are explained in a unified manner as properties near the Mott transition in a two-dimensional system whose spectral weights are shifted by next-nearest-neighbor hopping.