On non-trivial braiding of nodal points in “momentum space” (i.e. in the Brillouin torus):
QuanSheng Wu, Alexey A. Soluyanov, Tomáš Bzdušek, Non-Abelian band topology in noninteracting metals, Science 365 (2019) 1273-1277 (arXiv:1808.07469 ,doi:10.1126/science.aau8740)
Apoorv Tiwari, Tomáš Bzdušek, Non-Abelian topology of nodal-line rings in PT-symmetric systems, Phys. Rev. B 101 (2020) 195130 (doi:10.1103/PhysRevB.101.195130)
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