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

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

1998-12-15

arxiv.org/abs/cond-mat/9812251v1

Physics

Condensed Matter

Extended version of a talk given at the "6th International Conference on Path Integrals from peV to TeV" (25-29 August 1998, F

Scientific paper

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.

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