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- W1486110998 abstract "Weyl points (or Weyl fermions), the band touching points possessing linear dispersion and integer topological charges in 3D non-degenerate energy spectrum, have been widely studied recently in solid state materials within the context of Weyl semimetals. In this Letter, we propose that a Weyl point in the linear Weyl Hamiltonian can evolve into a Weyl knot with a twisted surface structure and similar topological properties by adding additional linear momentum (spin-independent) and cubic spin-orbit coupling terms in the Hamiltonian. We show that such Weyl knots can be realized in the quasiparticle energy spectrum of a 3D spin-orbit coupled degenerate Fermi gas subject to Zeeman fields, which supports Fulde-Ferrell Superfluids. The rich phase diagram that contains Weyl knots is obtained. We find that a Weyl knot has a quantized topological charge only as a whole and two Weyl knots can be connected to form a Weyl knot ring. We also find Dirac knot rings in 3D and Dirac knots in 2D but with equal Rashba and Dresselhaus spin-orbit coupling. In experiments, Weyl knots and Dirac knots may be probed by measuring their spectral density using momentum resolved photoemission spectroscopy." @default.
- W1486110998 created "2016-06-24" @default.
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- W1486110998 date "2014-11-26" @default.
- W1486110998 modified "2023-09-22" @default.
- W1486110998 title "Weyl Knots in 3D Spin-Orbit Coupled Fulde-Ferrell Superfluids" @default.
- W1486110998 hasPublicationYear "2014" @default.
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