Author(s): S. Grauer, K. M. Fijalkowski, S. Schreyeck, M. Winnerlein, K. Brunner, R. Thomale, C. Gould, and L. W. Molenkamp
Evidence of axionic insulating behavior is shown in thin topological insulator films via analysis of conductivity flow diagrams. As film thickness increases, the flow changes from a two-dimensional integer quantum Hall regime to one consistent with an axion insulator.
[Phys. Rev. Lett. 118, 246801] Published Fri Jun 16, 2017