Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session B42: Charge, Spin, and Superconductivity
11:15 AM–1:51 PM,
Monday, March 15, 2010
Sponsoring Unit: DCMP
Chair: Andrei Bernevig, Princeton University
Abstract ID: BAPS.2010.MAR.B42.12
Abstract: B42.00012 : Effective theory of Fermi pockets in fluctuating antiferromagnets*
1:27 PM–1:39 PM
Preview Abstract Abstract
Photo emission, STM, transport and other experiments in cuprate superconductors have revealed Fermi arc and Fermi pocket structures in underdoped regime. Here we present an analytical effective theory for the Fermi pocket structures appeared in electron excitation spectrum. The physics of Fermi pockets in the presence of fluctuating spin density wave order has been described by a U(1) gauge theory with charged fermions and bosonic spin fields, or the ``spin-fermion model''. We study a theory of bound states of spin and charge excitations in this model, and relate the bound state to physical electron excitations. We present a phenomenological effective Hamiltonian for the bound states, whose form is determined by symmetry and gauge invariance. The coupling constants of the theory will have to be determined by experiments. This effective model is used to calculate electron spectrum function across the entire Brillouin zone, and the result is compared to photo emission experiments.
*This research was supported by the National Science Foundation under grant DMR-0757145, by the FQXi foundation, and by a MURI grant from AFOSR.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.B42.12
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