论文标题
Srcu2(BO3)2中的Weyl-Triplons
Weyl-triplons in SrCu2(BO3)2
论文作者
论文摘要
我们提出,预计Weyl三级曲子将出现在规范的Shastry-Sutherland化合物中的低能磁激发中,\ CE {Srcu2(BO3)2},一种准2D量子磁铁。我们的结果表明,当将最小的,逼真的层间耦合添加到描述各个层的激发光谱的良好的显微镜模型中时,在2D模型的零场三联体频谱中出现的dirac点沿$ k_z $ noriess沿零景三模型分为两对Weyl点。改变层间DM交流的强度并应用较小的纵向磁场会导致一系列带流的跃迁,并伴随着变化的Weyl点。我们提出了非弹性中子散射以及热霍尔效应,作为检测该材料三倍谱中Weyl节点的实验技术。我们表明,在从状态Weyl点到具有拓扑间隙频段的政权以及热厅电导中的有限斜率的磁场的磁场的磁场的函数,零磁场的函数是有希望的证据证明Weyl Triplons的有希望的证据。
We propose that Weyl triplons are expected to appear in the low energy magnetic excitations in the canonical Shastry-Sutherland compound, \ce{SrCu2(BO3)2}, a quasi-2D quantum magnet. Our results show that when a minimal, realistic inter-layer coupling is added to the well-established microscopic model describing the excitation spectrum of the individual layers, the Dirac points that appear in the zero-field triplon spectrum of the 2D model split into two pairs of Weyl points along the $k_z$ direction. Varying the strength of the inter-layer DM-interaction and applying a small longitudinal magnetic field results in a range of band-topological transitions accompanied by changing numbers of Weyl points. We propose inelastic neutron scattering along with thermal Hall effect as the experimental techniques to detect the presence of Weyl node in the triplon spectrum of this material. We show that the logarithmic divergence in the second derivative in thermal Hall conductance near phase transition from regime Weyl points to a regime with topologically gapped bands as well as a finite slope in the thermal Hall conductance as a function of magnetic field at zero magnetic field are promising evidence for the presence of Weyl triplons.