Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-06-14
Nucl.Phys. B729 (2005) 317-360
Physics
Condensed Matter
Strongly Correlated Electrons
53 pages, no figures, added references, extended the introduction
Scientific paper
10.1016/j.nuclphysb.2005.09.004
By electron or hole doping quantum antiferromagnets may turn into high-temperature superconductors. The low-energy dynamics of antiferromagnets are governed by their Nambu-Goldstone bosons -- the magnons -- and are described by an effective field theory analogous to chiral perturbation theory for the pions in strong interaction physics. In analogy to baryon chiral perturbation theory -- the effective theory for pions and nucleons -- we construct a systematic low-energy effective theory for magnons and electrons or holes in an antiferromagnet. The effective theory is universal and makes model-independent predictions for the entire class of antiferromagnetic cuprates. We present a detailed analysis of the symmetries of the Hubbard model and discuss how these symmetries manifest themselves in the effective theory. A complete set of linearly independent leading contributions to the effective action is constructed. The coupling to external electromagnetic fields is also investigated.
Kämpfer F.
Moser Michael
Wiese Uwe-Jens
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