DOI: https://doi.org/10.30970/jps.13.4707
INVESTIGATION OF PHASE DIAGRAM OF HARD-CORE BOSON MODEL WITH NON-ERGODIC CONTRIBUTIONS
I. Stasyuk, O. Menchyshyn
Institute for Condensed Matter Physics, 1, Svientsitskii St., 79011, Lviv, Ukraine
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Journal of Physical Studies 13(1), Article 4707 [6 pages] (2009)
DOI: https://doi.org/10.30970/jps.13.4707 INVESTIGATION OF PHASE DIAGRAM OF HARD-CORE BOSON MODEL WITH NON-ERGODIC CONTRIBUTIONSI. Stasyuk, O. Menchyshyn Institute for Condensed Matter Physics, 1, Svientsitskii St., 79011, Lviv, Ukraine |
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The hard-core boson model which is isomorph to the XXZ anisotropic Heisnberg model is investigated in the self-consistent field approach. The Helmholtz free energy, the set of self-consistency equations and the pseudospin Green's functions are obtained. The approach used corresponds to random phase approximation with the inclusion of non-ergodic contributions. Their influence on the shape of phase diagram and position of the phase transition lines is analysed.
PACS number(s): 75.10.-b, 05.50.+q, 67.80.Kb