A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Wen, Colloquium: Zoo of quantum-topological phases of matter.Reviews of Modern Physics89(4), 041004 (2017)
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Linking extended vector wave fields with momentum space topology
A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.