We study the propagation of electromagnetic (EM) waves in a slab-type waveguide which walls consist of three-dimensional topological insulator (3D TI). The results show that a cutoff frequency with topological stability limits the spectrum that propagates along the waveguide and are in agreement with experimental observations. Our approach also provides a way to measure the penetration length of surface metallic states in 3D TI. arXiv:1507.04038v4 [cond-mat.mes-hall]
We investigate the behavior of spin polarized currents in two-dimensional topological insulators (TI). Stationary solutions inside a HgTe/CdTe quantum well (QW) were obtained by Bernevig-Hughes-Zhang (BHZ) model modified by a electric and magnetic barrier inside a non-completely insulating bulk. An attenuated quantum spin Hall (QSH) effect occurs in the gaped region with an apparent Klein-like paradox. Even more interesting, for strong potential regime, the interaction between the quasiparticles and the barriers allows spin inversion of this electronic states in a distinct channel conduction. Thus, our findings suggest a mechanism to manipulated spin polarized currents in this system.
We study a modified classical electromagnetism in (3+1) dimensions, whose lagrangian includes a term proportional to a (constant) background tensorial object that breaks the Lorentz symmetry (active Lorentz or particle transformation), but respects CPT. Our attention is devoted to the plane wave-like solutions in a particular submodel. We study possible modes of propagation inside two different enviroments: a rectangular waveguide and coaxial transmission line.
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