2009/06/08 by S. Banerjee, R. R. P. Singh, V. Pardo +1 · 2 citations
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.103.016402
published as Phys. Rev. Lett. 103, 016402 (2009) · accepted for publication in Physical Review Letters
arxiv created 2009/06/08 · arxiv updated 2015/05/13
We develop a tight-binding model description of semi-Dirac electronic spectra, with highly anisotropic dispersion around point Fermi surfaces, recently discovered in electronic structure calculations of VO2/TiO2 nano-heterostructures. We contrast their spectral properties with the well known Dirac points on the honeycomb lattice relevant to graphene layers and the spectra of bands touching each other in zero-gap semiconductors. We also consider the lowest order dispersion around one of the semi-Dirac points and calculate the resulting electronic energy levels in an external magnetic field. We find that these systems support apparently similar electronic structures but diverse low-energy physics.