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首页> 外文期刊>Physical review >Rapid filling of the spin gap with temperature in the Schwinger-boson mean-field theory of the antiferromagnetic Heisenberg kagome model
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Rapid filling of the spin gap with temperature in the Schwinger-boson mean-field theory of the antiferromagnetic Heisenberg kagome model

机译：在施韦格玻色子的温度下快速填充斯波亨特 - 玻色子的温度 - 反铁磁海森伯格kagome模型

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摘要

Using Schwinger-boson mean-field theory, we calculate the dynamic spin structure factor at low temperatures 0 T J for the spin-1/2 antiferromagnetic Heisenberg kagome model, within the gapped Z(2) spin liquid phase Ansatz. We find that the spectral gap rapidly fills with temperature, with robust low-energy spectral weight developing by a temperature of Delta/3, where the spin gap is 2 Delta (i.e., Delta is the spinon gap), before any appreciable rise in spinon density or change in zero-temperature mean-field parameters. This is due to deconfinement of spinons which leads to terms suppressed only by exp(-Delta/T). At still higher temperatures, the spinon density increases rapidly leading to a breakdown of the Schwinger-boson mean-field approach. We suggest that if the impurity-free spectral functions can be obtained through neutron scattering experiments on kagome herbertsmithites, temperature dependence of the subgap weight can provide distinct signatures of a Z(2) quantum spin liquid.
机译：采用施韦林 - 玻色子叶片场理论，我们在旋转Z（2）旋转液相鞍山内，计算低温0

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  • 来源
    《Physical review》 |2019年第15期|155151.1-155151.15|共15页
  • 作者

    Halimeh Jad C.; Singh Rajiv R. P.;

  • 作者单位

    Max Planck Inst Phys Komplexer Syst Nothnitzer Str 38 D-01187 Dresden Germany|Tech Univ Munich Phys Dept D-85747 Garching Germany;

    Univ Calif Davis Dept Phys Davis CA 95616 USA;

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