U(1)XSU(2) Gauge theory of underdoped high Tc cuprates via Chern-Simons bosonization

TL;DR

This paper develops a gauge theory for underdoped high-Tc cuprates using Chern-Simons bosonization, explaining key experimental phenomena such as the spin-gap, antiferromagnetic correlations, Fermi surface features, and resistivity behavior.

Contribution

It introduces a novel U(1)XSU(2) gauge theory derived from the t-J model, providing a unified framework for understanding various experimental observations in underdoped cuprates.

Findings

Spin-gap remains finite in all directions.

Antiferromagnetic correlation length scales with doping.

Model predicts a small Fermi surface pocket and linear resistivity with temperature.

Abstract

We outline the basic ideas involved in a recently proposed derivation of a gauge theory for underdoped cuprates in the "spin-gap phase", performed essentially step by step starting from the t-J model, considered as a model Hamiltonian for the CuO_2 layers. The basic tool is the U(1)XSU(2) Chern-Simons bosonization, to which it is dedicated a somewhat detailed discussion. The basic output is a "spin-gap" not vanishing in any direction and an antiferromagnetic correlation length proportional to the inverse square root of doping concentration, in agreement with data deduced from the neutron experiments. The model also exhibits a small half-pocket Fermi surface around (\pi/2, \pi/2) and a linear in temperature dependence of in-plane resistivity in certain temperature range.