Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-06-26
Physica C 460-462 (2007) 1139-1140
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, Submitted to Physica C, Proceedings of M2S-HTSC 2006 Dresden
Scientific paper
10.1016/j.physc.2007.03.241
The low-energy physics of antiferromagnets is governed by their Goldstone bosons -- the magnons -- and it is described by a low-energy effective field theory. In analogy to baryon chiral perturbation theory, we construct the effective field theory for magnons and holes in an antiferromagnet. It is a systematic low-energy expansion based on symmetry considerations and on the fact that the holes are located in pockets centered at k=(pi/2a,\pm pi/2a). Even though the symmetries are extracted from the Hubbard model, the effective theory is universal and makes model-independent predictions about the dynamical mechanisms in the antiferromagnetic phase. The low-energy effective theory has been used to investigate one-magnon exchange which leads to a d-wave-shaped bound state of holes.
Brügger C.
Kämpfer F.
Moser Michael
Pepe Michele
Wiese Uwe-Jens
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