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Theory of triplon dynamics in the quantum magnet BiCu_2PO_6

机译:量子磁体BiCu_2PO_6中的三重动力学理论

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摘要

We provide a theory of triplon dynamics in the valence bond solid ground state of the coupled spin ladders modeled for BiCu_2PO_6. Utilizing the recent high-quality neutron scattering data [K. W. Plumb et al., Nat. Phys. 12, 224 (2016)] as guides and a theory of interacting triplons via the bond operator formulation, we determine a minimal spin Hamiltonian for this system. It is shown that the splitting of the low-energy triplon modes and the peculiar magnetic field dependence of the triplon dispersions can be explained by including substantial Dzyaloshinskii-Moriya and symmetric anisotropic spin interactions. Taking into account the interactions between triplons and the decay of the triplons to the two-triplon continuum via anisotropic spin interactions, we provide a theoretical picture that can be used to understand the main features of the recent neutron scattering experimental data.
机译:我们为BiCu_2PO_6建模的耦合自旋梯的价键固体基态提供了三重动力学理论。利用最新的高质量中子散射数据[K. W.物理12,224(2016)]作为指导,以及通过键算子公式相互作用三链体的理论,我们确定了该系统的最小自旋哈密顿量。结果表明,低能三重模的分裂和三重分散体独特的磁场依赖性可以通过包含大量的Dzyaloshinskii-Moriya和对称的各向异性自旋相互作用来解释。考虑到三元组之间的相互作用以及三元组通过各向异性自旋相互作用向两三元组连续体的衰减,我们提供了可用于理解最近中子散射实验数据主要特征的理论图。

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  • 来源
    《Physical review》 |2016年第23期|235130.1-235130.11|共11页
  • 作者

    Kyusung Hwang; Yong Baek Kim;

  • 作者单位

    Department of Physics and Centre for Quantum Materials, University of Toronto, Toronto, Ontario, Canada M5S 1A7;

    Department of Physics and Centre for Quantum Materials, University of Toronto, Toronto, Ontario, Canada M5S 1A7,Canadian Institute for Advanced Research/Quantum Materials Program, Toronto, Ontario, Canada MSG 1Z8,School of Physics, Korea Institute for Advanced Study, Seoul 130-722, Korea;

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