Open AccessОсобенности фазовой диаграммы полужестких бозонов на квадратной решетке
Author(s) -
В.В. Конев,
Ю.Д. Панов
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.09.51266.27h
Subject(s) - boson , phase diagram , physics , mean field theory , charge (physics) , condensed matter physics , phase transition , limit (mathematics) , limiting , phase (matter) , statistical physics , transformation (genetics) , mathematical physics , mathematics , quantum mechanics , chemistry , mathematical analysis , mechanical engineering , biochemistry , engineering , gene
We investigated the phase diagrams of a system of charged semi-hardcore bosons in the mean-field approximation. It is shown that an increase in the local correlation parameter leads to the transformation of the phase diagram of the system from the form characteristic of hard-core bosons to the limit form with a parabolic dependence of the critical temperature of the charge ordering on the boson concentration. The evolution between these limiting cases depends on the ratio of the model parameters and is accompanied by various effects, including a change in the type of phase transition, the appearance of new order-order transitions, and the appearance of new critical points.