论文标题
II型狄拉克光子晶格
Type-II Dirac photonic lattices
论文作者
论文摘要
与I型狄拉克半学型的费米表面不同,II Dirac Semimetal的点是一对交叉线,因为Dirac锥体用开放且双曲线的同源脉络度倾斜。作为光学类比,II型狄拉克光子晶格也被设计了。在这里,我们报告了由Lieb样光子晶格中的II型狄拉克锥体,由相同的波导通道组成,带状结构的各向异性既不是由于折射率变化也不是环境,而是晶格的空间对称性。因此,该提案是优势,而有益于实验观察。详细研究了参数类型II光子晶格中的圆锥形衍射和klein隧穿。我们的结果提供了一个简单而实验性的可行平台,用于研究围绕II型Dirac锥体周围的二维拓扑光子和其他非层次主义现象。
Different from the Fermi surface of the type-I Dirac semimetal being a point, that of the type-II Dirac semimetal is a pair of crossing lines because the Dirac cone is tilted with open and hyperbolic isofrequency contours. As an optical analogy, type-II Dirac photonic lattices have been also designed. Here, we report type-II Dirac cones in Lieb-like photonic lattices composed of identical waveguide channels, and the anisotropy of the band structure is due to neither the refractive index change nor the environment, but only the spatial symmetry of the lattice; therefore, the proposal is advantage and benefits experimental observation. Conical diffractions and Klein tunneling in the parametric type-II photonic lattice are investigated in detail. Our results provide a simple and experimental feasible platform to study two-dimensional topological photonic and other nonrelativistic phenomena around type-II Dirac cones.