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We discuss the ground state properties and the collective dynamics of spiral magnetic states in the two dimensional Hubbard model. In particular we present the phase diagram in the presence of a finite next-nearest-neighbor hopping integral t′. In contrast to the plain t Hubbard-model we find a region of stable antiferromagnetism in an extended interval of electron (hole) doping off half filling for a negative (positive) ratio of t′/t. In addition we investigate the coupled charge and spiral spin-excitations off half filling. The resulting collective modes are found to be highly anisotropic and strongly Landau damped.
Journal of Low Temperature Physics – Springer Journals
Published: Nov 21, 2004
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