论文标题
巨大倾斜的2D狄拉克材料中的双曲线等离子体
Hyperbolic plasmons in massive tilted 2D Dirac materials
论文作者
论文摘要
我们探索了巨大各向异性倾斜的狄拉克系统中表面电磁模式传播类型的拓扑转变。与无间隙系统相比，倾斜和质量的存在产生了一个间接的带隙，从而强烈改变了状态的关节密度。出现了新的van霍夫奇异性，并且带内和带间跃迁之间的相互作用导致各向异性光学传导率，而假想的零件在正交方向上获得相反的迹象，从而开放了具有血浆血浆过度传播的可能性。从色散关系获得的同频轮廓和低等离子损耗表明，纯粹的各向异性准准纤维化和定义明确的，高方向的，高曲折的模式之间的过渡仅在倾斜和质量同居时才能达到。 THZ制度中的微调表明，这可能是一种动态探针，可作为乳汁中倾斜和质量的动态探针。
We explore topological transitions in the type of propagation of surface electromagnetic modes in massive anisotropic tilted Dirac systems. The presence of tilting and mass gives rise to an indirect band gap that strongly modifies the joint density of states compared to the gapless system. New van Hove singularities appear, and the interplay between intra and interband transitions leads to an anisotropic optical conductivity with imaginary parts acquiring opposite signs in orthogonal directions, opening the possibility of having hyperbolic propagation of plasmons. Isofrequency contours and low plasmon losses, as obtained from the dispersion relation, show that transitions between purely anisotropic quasi-elliptical and well-defined, highly directional, hyperbolic modes are attainable only when tilt and mass coexist. Fine-tuning in the THz regime suggests that this might be useful as a dynamical probe of concurring tilt and mass in Dirac materials.
