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http://elar.urfu.ru/handle/10995/118389
Название: | Critical Temperatures of Hard-Core Boson Model on Square Lattice within Bethe Approximation |
Авторы: | Spevak, E. L. Panov, Y. D. Moskvin, A. S. |
Дата публикации: | 2021 |
Издатель: | Pleiades journals |
Библиографическое описание: | Spevak E. L. Critical Temperatures of Hard-Core Boson Model on Square Lattice within Bethe Approximation / E. L. Spevak, Y. D. Panov, A. S. Moskvin // Physics of the Solid State. — 2021. — Vol. 63. — Iss. 10. — P. 1546-1552. |
Аннотация: | Abstract: Neighboring correlations are considered for a two-dimensional hard-core boson model on square lattice within Bethe approximation for the clusters consisting of two and four nodes. Explicit equations are derived for the determination of critical temperatures of charge and superfluid ordering and their solutions are considered for various ratios of the parameter of between-centers charge correlations to the transfer integral. It is demonstrated that assumption of neighboring correlations for the temperatures of charge ordering results in the appearance of the critical concentration of bosons, which restricts the existence domain of the solutions of charge ordering type. In the case of superfluid ordering with the assumption of neighboring correlations, the critical temperature is reduced up to zero values at half filling. A phase diagram of the hard-core boson model is constructed with the assumption of phase separation within Maxwell construction and it is shown that consideration of neighboring correlations within Bethe approximation quantitatively approximates the form of phase diagram to the results of Monte Carlo quantum method. © 2021, Pleiades Publishing, Ltd. |
Ключевые слова: | BETHE APPROXIMATION BOGOLYUBOV INEQUALITY HARD-CORE BOSONS PHASE DIAGRAM |
URI: | http://elar.urfu.ru/handle/10995/118389 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор РИНЦ: | 47528079 |
Идентификатор SCOPUS: | 85119137983 |
Идентификатор WOS: | 000732514300030 |
Идентификатор PURE: | 29482797 |
ISSN: | 10637834 |
DOI: | 10.1134/S1063783421090389 |
Сведения о поддержке: | Ministry of Education and Science of the Russian Federation, Minobrnauka; Government Council on Grants, Russian Federation: FEUZ-2020-0054 The work was supported by the Program 211 of the Government of Russian Federation, agreement no. 02.A03.21.0006, and project FEUZ-2020-0054 of the Ministry of Education and Science of Russian Federation. |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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2-s2.0-85119137983.pdf | 865,12 kB | Adobe PDF | Просмотреть/Открыть |
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