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2014

Dirac cones for point scatterers on a honeycomb lattice

Lee, Minjae

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We investigate the spectrum and the dispersion relation of the Schr\"odinger operator with point scatterers on a triangular lattice and a honeycomb lattice.

We prove that the low-level dispersion bands have conic singularities near Dirac points, which are the vertices of the first Brillouin Zone.
The existence of such conic dispersion bands plays an important role in various electronic properties of honeycomb-structured materials such as graphene.
We then prove that for a honeycomb lattice, the spectra generated by higher-level dispersion relations are all connected so the complete spectrum consists of at most three bands.

Dirac cones for point scatterers on a honeycomb lattice · Around

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