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|Title:||Global topology of Weyl semimetals and Fermi arcs|
|Citation:||Journal of Physics A: Mathematical and Theoretical, 2017; 50(11):1-11|
|Varghese Mathai and Guo Chuan Thiang|
|Abstract:||We provide a manifestly topological classification scheme for generalised Weyl semimetals, in any spatial dimension and with arbitrary Weyl surfaces which may be non-trivially linked. The classification naturally incorporates that of Chern insulators. Our analysis refines, in a mathematically precise sense, some well-known 3D constructions to account for subtle but important global aspects of the topology of semimetals. Using a fundamental locality principle, we derive a generalized charge cancellation condition for the Weyl surface components. We analyse the bulk-boundary correspondence under a duality transformation, which reveals explicitly the topological nature of the resulting surface Fermi arcs. We also analyse the effect of moving Weyl points on the bulk and boundary topological semimetal invariants.|
|Keywords:||Weyl semimetals; Fermi arcs; relative homology; ambient isotopy; Mayer–Vietoris sequence; bulk-boundary correspondence; links|
|Rights:||© 2017 IOP Publishing Ltd|
|Appears in Collections:||Mathematical Sciences publications|
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