A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Schmidt,et al., SPELEEM: Combining LEEM and Spectroscopic Imaging.Surface Review and Letters05(06), 1287–1296 (1998)
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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.