论文标题
在交错的磁场下，基塔夫旋转液体中Majorana激发光谱和非旋转热传输的不对称调节
Asymmetric modulation of Majorana excitation spectra and nonreciprocal thermal transport in the Kitaev spin liquid under a staggered magnetic field
论文作者
论文摘要
我们介绍了Kitaev Honeycomb模型在交错的磁场下，除了均匀的磁场外，Majorana带结构和热传输性能的理论结果。 Majorana带结构在动量空间中不对称地调节，山谷的自由度受到均匀和交错的磁场的大小和方向的激活和控制。结果，Majorana激发要么是散布的，要么是无间隙的，后者通常具有Majorana fermi表面，而不是在没有田地的情况下。我们表明，除线性外，Majorana带的不对称变形还会诱导非线性（非转化）热传输。线性热电流的场依赖性与Majoraana间隙的大小相关，而非线性热电流的幅度与Majoraana激发光谱的不对称性相关。我们显示了热电流的估计值，并讨论了线性响应在实验上是可以测量的，而观察非线性的响应是必需的。我们还讨论了热电流如何通过磁场的其他其他效果以及传统镁的贡献调节，后者在异质结构中预计将实现内部交错的磁场。
We present the theoretical results for the Majorana band structure and thermal transport properties in the Kitaev honeycomb model under a staggered magnetic field in addition to a uniform one. The Majorana band structure is asymmetrically modulated in momentum space, and the valley degree of freedom is activated and controlled by the magnitudes and directions of the uniform and staggered magnetic fields; as a result, the Majorana excitation is either gapped or gapless, the latter of which in general has Majorana Fermi surfaces, in contrast to the point nodes in the absence of the fields. We show that the asymmetric deformation of the Majorana band induces a nonlinear (nonreciprocal) thermal transport, in addition to the linear one. The field dependence of the linear thermal current is correlated with the magnitude of the Majorana gap, while that of the nonlinear thermal current is associated with the asymmetry of the Majorana excitation spectra. We show the estimates of the thermal currents and discuss that the linear response is experimentally measurable, whereas future improvement is required for the observation of the nonlinear one. We also discuss how the thermal currents are modulated by other additional effects of the magnetic field and contributions from conventional magnons, latter of which are expected in heterostructures to realize an internal staggered magnetic field.
