The talk introduces to topological materials, defined by presence of Dirac or Weyl nodes, provided by break of the spatial or time symmetry. In those special points of the reciprocal space, the crossing bands does not hybridize due to topological protection. Example of several material is shown. The presence of Weyl nodes in bulk implies topologically protected surface states (called Fermi arcs), where electron spin is connected to electron direction of propagation, providing tool to transfer angular momentum in devices.
Seminar on 18 October 2018
Charles University, Faculty of Mathematics and Physics, Praha, Czech Republic
Introduction to topological materials
joined with Nanoseminar (note different time and place)
at 14:00 in Lecture Hall F2