Volume 119, Number 2, July 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 September 2017|
Lattice symmetries, spectral topology and opto-electronic properties of graphene-like materials
Institut für Physik, Universität Augsburg - D-86135 Augsburg, Germany
Received: 24 August 2017
Accepted: 11 September 2017
The topology of the band structure, which is determined by the lattice symmetries, has a strong influence on the transport properties. Here we consider an anisotropic honeycomb lattice and study the effect of a continuously deformed band structure on the optical conductivity and on diffusion due to quantum fluctuations. In contrast to the behavior at an isotropic node we find super- and subdiffusion for the anisotropic node. The spectral saddle points create van Hove singularities in the optical conductivity, which could be used to characterize the spectral properties experimentally.
PACS: 73.50.Bk – General theory, scattering mechanisms / 73.23.-b – Electronic transport in mesoscopic systems / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
© EPLA, 2017
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