Hubbard Trimer with Spin-Orbit Coupling: Hartree-Fock Solutions, (Non)Collinearity, and Anisotropic Spin Hamiltonian.

Hubbard Trimer with Spin-Orbit Coupling: Hartree-Fock Solutions, (Non)Collinearity, and Anisotropic Spin Hamiltonian.
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具有自旋轨道耦合的 Hubbard 三聚体:Hartree-Fock 解、(非)共线性和各向异性自旋哈密顿量

DOI:
10.1021/acs.jpca.8b11959
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发表时间:
2019
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
M. Kaupp
M. Kaupp
中科院分区:
--
文献类型:
--
作者:
S. Ghassemi Tabrizi;A. V. Arbuznikov;M. Kaupp

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我们给出了等边三角形单带哈伯德模型的无限制和广义Hartree-Fock解(分别为UHF和GHF)。自洽地处理了自旋轨道耦合(SOC)问题,详细研究了HF稳定性和不同自旋结构的性质。当穿过参数空间中的高对称点时,GHF解从非共线切换到共线(由自旋守恒和自旋相关跳跃的振幅跨越,即,动能和SOC)。共线GHF解代表了一个简单的例子来反驳斯莱特行列式中的共线矢量自旋密度必然需要定义的自旋投影的概念。从HF能量中提取三个自旋1/2中心之间的各向异性相互作用的自旋哈密顿参数,并随后与有效哈密顿理论的精确结果进行比较。这提供了一个明确的基准解释破缺对称平均场解的自旋配置,并把这种半经典的方法(经常应用于破缺对称密度泛函理论)的坚实基础。
We present unrestricted and generalized Hartree–Fock solutions (UHF and GHF, respectively) for the single-band Hubbard model of an equilateral triangle. Spin–orbit coupling (SOC) is treated self-consistently, and HF stability and properties of different spin structures are studied in detail. The GHF solution switches from noncollinear to collinear when crossing a high-symmetry point in parameter space (spanned by the amplitudes of spin-conserving and spin-dependent hopping, i.e., kinetic energy and SOC, respectively). The collinear GHF solution represents a simple example to disprove the notion that a collinear vector spin density in a Slater determinant necessarily entails a defined spin projection. Spin Hamiltonian parameters for the anisotropic interaction between three spin-1/2 centers are extracted from HF energies and subsequently compared to exact results from effective Hamiltonian theory. This provides an unambiguous benchmark for interpreting broken-symmetry mean-field solutions in terms of spin configurations and puts this semiclassical approach (frequently applied in broken-symmetry density functional theory) on a firmer basis.
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