Abstract
The mineral tetradymite structures are interesting classes of materials. At their bandgap just near to the Fermi level they sustain time-reversal-invariant topological effects, which appears up in exceptional electronic surface states captured in the so-far investigated mass-less Dirac cones [1]. Another characteristic of tetradymites is caused by the huge uniaxial electric anisotropic behaviour of the material. It has been shown that tetradymites and in particular Bi2Se3 and Bi2Te3 belong to the naturally rare class of hyperbolic materials [2] in the visible frequency range, with a smooth transition from the elliptical to the hyperbolic dispersion, by marching over the frequency of excitation. Fig. 1 (a) shows the permittivity of Bi2Se3 obtained using the generalized spectroscopic ellipsometry technique reported in ref. [2].
© 2015 IEEE
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