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cond-mat.stat-mech2003
Spatial decay of the one-body density matrix in insulators revised
Janusz Jedrzejewski, Taras Krokhmalskii
In the framework of the band theory, we consider two tight-binding models of insulators. The first one, proposed recently by Taraskin et al, is a translationally invariant system,…
cond-mat2003
Dynamics of zz spin correlations in the square-lattice spin-1/2 isotropic XY model
Oleg Derzhko, Taras Krokhmalskii
Using the Jordan-Wigner fermionization in two dimensions we obtain the zz wave vector- and frequency-dependent structure factor for the spin-1/2 isotropic XY model on a spatially a…