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Title:
Time-reversal in topological semimetals
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Abstract:
Experimentally realised Weyl semimetals have time-reversal invariance, but their topological indices had not been properly understood in this setting. It turns out that Weyl points become a new type of "Fu-Kane-Mele monopole", and that their creation-annihilation histories provide a simple and mathematically equivalent way to classify semimetals. The surface Fermi arcs and Dirac cones coexist in a subtle way and may transmute between each other without a topological phase transition. Interface surface state topology can be easily inferred, and is verified by numerical calculations.
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