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cond-mat1994★ 20 cited
Symmetries and Mean-Field Phases of the Extended Hubbard Model
A. B. Eriksson, T. Einarsson, S. Ostlund
The two-dimensional extended Hubbard model that includes a nearest- neighbor Heisenberg interaction is studied using a mean-field theory where quasiparticles are defined by an U(8)…
cond-mat1993★ 72 cited
Frustrated Honeycomb Heisenberg Antiferromagnet: A Schwinger Boson Approach
Ann Mattsson, Per Fröjdh, Torbjörn Einarsson
We analyze the frustrated Heisenberg antiferromagnet defined on a honeycomb lattice using a Schwinger-boson mean-field theory. The spin-wave velocity and the susceptibility are pre…