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High-field expansion approach to kagome antiferromagnets with Dzyaloshinskii-Moriya interactions

机译:具有Dzyaloshinskii-Moriya互动的Kagome反霉菌的高场膨胀方法

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摘要

We apply linked cluster expansion techniques to study the polarized high-field phase of a spin-1/2 antiferro-magnet on the kagome lattice with Heisenberg and Dzyaloshinskii-Moriya interactions (DMI). We find that the Dirac points of the single-magnon spectrum without DMI are robust against arbitrary DMI when the magnetic field lies in the kagome plane. Unlike the typical case where DMI gaps the spectrum, here we find that varying the DMI merely shifts the location of the Dirac points. In contrast, a magnetic field with a component out of the kagome plane gaps the spectrum, leading to topological magnon bands. We map out a topological phase diagram as the couplings are varied by computing the band Chern numbers. A pair of phase transitions are observed and we find an enhanced thermal Hall conductivity near the phase boundary.
机译:我们应用链接的集群扩展技术,以研究Kagomeberg和Dzyaloshinskii-Moriya相互作用(DMI)在Kagome格子上的纺丝1/2抗散磁铁的偏振高场阶段。我们发现,当磁场位于Kagome平面中时,没有DMI的单次奖金光谱的DIRAC点对任意DMI具有鲁棒。与DMI间隙频谱的典型情况不同,这里我们发现改变DMI只是将DICAC点的位置移位。相反,具有kagome平面中的组件的磁场间隙差距,导致拓扑巨大的磁带。我们将拓扑相图映射出拓扑相图,因为通过计算频带切除号码来改变耦合。观察到一对相变,并且在相边界附近找到增强的热霍尔电导率。

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  • 来源
    《Physical review》 |2019年第12期|121108.1-121108.5|共5页
  • 作者单位

    Univ Calif Davis Dept Phys Davis CA 95616 USA;

    Univ Calif Davis Dept Phys Davis CA 95616 USA;

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  • 正文语种 eng
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