Spin stiffness in the Hubbard model
J M J van Leeuwen; M S L du Croo de Jongh; P J H Denteneer; J M J van Leeuwen; Instituut-Lorentz, University of Leiden, PO Box 9506, 2300 RA Leiden, The Netherlands; M S L du Croo de Jongh; Instituut-Lorentz, University of Leiden, PO Box 9506, 2300 RA Leiden, The Netherlands; P J H Denteneer; Instituut-Lorentz, University of Leiden, PO Box 9506, 2300 RA Leiden, The Netherlands
Журнал:
Journal of Physics A: Mathematical and General
Дата:
1996-01-07
Аннотация:
The spin stiffness of the repulsive Hubbard model that occurs in the hydrodynamic theory of antiferromagnetic spin waves is shown to be the same as the thermodynamically defined stiffness involved in twisting the order parameter. New expressions for are derived, which facilitate the interpretation, and connections with superconducting weight and gauge invariance are discussed.
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