Numerical verification of topological crossings in band structure of solids

Geunsik Lee, Jai Sam Kim, J Zak
2003 Journal of Physics: Condensed Matter  
There have been recent predictions of topologically unavoidable branch crossing in the energy band structure of solids. In this paper calculations of energy dispersion relations are carried out in a number of crystals with orthorhombic space group (SG) symmetry. Our calculations verify the topological crossings and are in good agreement with the predictions based on representations of SGs.
doi:10.1088/0953-8984/15/12/317 fatcat:lvsvjezzmvgntmxhetfng2r7ze