Tight-binding modeling and low-energy behavior of the semi-Dirac point
Abstract
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 VO/TiO 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.
Cite
@article{arxiv.0906.1564,
title = {Tight-binding modeling and low-energy behavior of the semi-Dirac point},
author = {S. Banerjee and R. R. P. Singh and V. Pardo and W. E. Pickett},
journal= {arXiv preprint arXiv:0906.1564},
year = {2015}
}
Comments
accepted for publication in Physical Review Letters