Publication:
Spectral characteristics of the antiferromagnetic spin-1/2 Heisenberg model on the square lattice in a magnetic field

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W3013520612.pdf(820.36 KB)
Дата
2021
Авторы
Barabanov, A. F.
Savchenkov, P. S.
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Научные группы
Организационные подразделения
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Аннотация
© 2020 Elsevier B.V.We predict that spin-waves in an ordered square quantum antiferromagnet in a magnetic field (h) perpendicular to antiferromagnetic plane may demonstrate three modes of spin excitations. Starting from the self-consistent rotation-invariant Green's function method, a new mean-field theory is constructed for h≠0. The method preserves the translational and the axial symmetries, and provides exact fulfillment of the single-site constraint for each of the three modes. We examine the dynamical structure factors Sαα(k,ω),α(β) = x, y, z. It is shown, that the introduction of h leads to the hybridization of two degenerate spin modes due to the appearance of a nondiagonal on α,β spin-spin Green's functions. The comparison of the theory with the exact diagonalization study and with results on inelastic neutron scattering experiments is discussed at T = 0. We discuss also the correspondence of the present theory to the existing theories, which allow only two spin excitations modes for the total S(k,ω).
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Barabanov, A. F. Spectral characteristics of the antiferromagnetic spin-1/2 Heisenberg model on the square lattice in a magnetic field / Barabanov, A.F., Savchenkov, P.S. // Journal of Magnetism and Magnetic Materials. - 2021. - 521. - 10.1016/j.jmmm.2020.167505
URI
https://www.doi.org/10.1016/j.jmmm.2020.167505
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85095915484&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000599827900007
 https://openrepository.mephi.ru/handle/123456789/23470
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