Department of Physics and Astronomy, Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854-8019, USA.
Department of Physics, Kent State University, Kent, Ohio 44242, USA.
Phys Rev Lett. 2013 Nov 27;111(22):226403. doi: 10.1103/PhysRevLett.111.226403.
Current theories of Kondo insulators employ the interaction of conduction electrons with localized Kramers doublets originating from a tetragonal crystalline environment, yet all Kondo insulators are cubic. Here we develop a theory of cubic topological Kondo insulators involving the interaction of Γ(8) spin quartets with a conduction sea. The spin quartets greatly increase the potential for strong topological insulators, entirely eliminating the weak topological phases from the diagram. We show that the relevant topological behavior in cubic Kondo insulators can only reside at the lower symmetry X or M points in the Brillouin zone, leading to three Dirac cones with heavy quasiparticles.
目前的 Kondo 绝缘体理论采用传导电子与来源于四方晶态环境的局域 Kramers 二重态之间的相互作用，但所有 Kondo 绝缘体都是立方的。在这里，我们提出了一种涉及Γ(8)自旋四重态与传导海相互作用的立方拓扑 Kondo 绝缘体理论。自旋四重态极大地增加了强拓扑绝缘体的可能性，完全消除了图中的弱拓扑相。我们表明，立方 Kondo 绝缘体中的相关拓扑行为只能存在于布里渊区的较低对称性 X 或 M 点，导致具有重准粒子的三个狄拉克锥。
