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cond-mat.str-el2000
Marshall-Peierls sign rule in frustrated Heisenberg chains
Andreas Voigt, Johannes Richter
We consider the frustrated antiferromagnetic s=1 Heisenberg quantum spin chain with regard to the Marshall-Peierls sign rule (MPSR). By using exact diagonalization data we investig…
cond-mat2000
Diagonalization of a bosonic quadratic form using CCM: Application on a system with two interpenetrating square lattice antiferromagnets
Sven E. Krueger, Dirk Schmalfuss, Johannes Richter
While the diagonalization of a quadratic bosonic form can always be done using a Bogoliubov transformation, the practical implementation for systems with a large number of differen…