A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Neuhaus,et al., Polarimetric interferometer with attosecond stability for time-resolved pump-probe photoemission microscopy.Ultramicroscopy279, 114248 (2026)
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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.