U(1)×SU(2) Gauge Theory of Underdoped Cuprate Superconductors

Author:

Marchetti P. A.1,Su Zhao-Bin2,Yu Lu23

Affiliation:

1. Dipartimento di Fisica "G. Galilei", INFN, I–35131 Padova, Italy

2. Institute of Theoretical Physics, CAS, Beijing 100080, China

3. International Centre for Theoretical Physics, I-34100 Trieste, Italy

Abstract

The U(1)×SU(2) Chern–Simons gauge theory is applied to study the 2D t–J model describing the normal state of underdoped cuprate superconductors. The U(1) field produces a flux phase for holons converting them into Dirac-like fermions, while the SU(2) field, due to the coupling to holons gives rise to a gap for spinons. An effective low-energy action involving holons, spinons and a self-generated U(1) gauge field is derived. The Fermi surface and electron spectral function obtained are consistent with photoemission experiments. The theory predicts a minimal gap proportional to doping concentration. It also explains anomalous transport properties.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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