Normal state pseudogap and (\pi,0) feature in the underdoped high-T_c cuprates. A microscopical theory

TL;DR

This paper presents a microscopic theory for the pseudogap and (,) features in underdoped high-_c_ cuprates, highlighting the role of electronic topological transitions in a 2D electron system.

Contribution

It introduces a simple 2D lattice model with extended hopping and spin exchange interactions that reproduces key experimental features of underdoped cuprates.

Findings

Reproduces the normal state pseudogap behavior.

Explains the doping and temperature dependence of the spectrum.

Highlights the significance of electronic topological transitions in 2D systems.

Abstract

We show that a simple 2D electron system on a square lattice with hoping between more than nearest neighbors exhibits in the presence of electron spin exchange interaction properties strikingly similar to those observed in the underdoped cuprates It is a normal state pseudogap, its behaviour with doping and T, a form of the spectrum around (0,\pi) etc. The motor is the electronic topological transition which due to two-dimensionality gets new features with respect to well-studied 3D case.