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Hubbard pair cluster in the external fields. Studies of the magnetic properties

机译:Hubbard对群集在外部字段中。 研究磁性

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摘要

The magnetic properties of the two-site Hubbard cluster (dimer or pair), embedded in the external electric and magnetic fields and treated as the open system, are studied by means of the exact diagonalization of the Hamiltonian. The formalism of the grand canonical ensemble is adopted. The phase diagrams, on-site magnetizations, spin-spin correlations, mean occupation numbers and hopping energy are investigated and illustrated in figures. An influence of temperature, mean electron concentration, Coulomb U parameter and external fields on the quantities of interest is presented and discussed. In particular, the anomalous behaviour of the magnetization and correlation function vs. temperature near the critical magnetic field is found. Also, the effect of magnetization switching by the external fields is demonstrated. (C) 2018 Elsevier B.V. All rights reserved.
机译:通过Hamiltonian的精确对角线研究了嵌入在外部电场和磁场中并被视为开放系统的双地毂簇(二聚体或配对)的磁性。 采用了大规范合奏的形式主义。 在图中研究了相框,现场磁化,旋转旋转相关性,平均占用数和跳跃能量。 提出和讨论了温度,平均电子浓度,库仑U参数和外部场的影响。 特别地,找到磁化和相关函数与临界磁场附近的温度的异常行为。 而且,证明了外部领域的磁化切换的效果。 (c)2018年elestvier b.v.保留所有权利。

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