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- W4310286284 abstract "We introduce a general mechanism for obtaining Weyl points in a stack of 2D quasicrystals, which can be extended to any stack of aperiodic layers. We do so by driving a topological phase transition with the vertical crystal-momentum as the tuning parameter, which leads to gap closures at the critical points sourcing Berry curvature. To illustrate, we use a simple 3D generalization of the Qi-Wu-Zhang model defined on a Penrose quasicrystal. The presence of Weyl points is established via the local Chern marker, projected band structure and density of states. Interestingly, we uncover an analogue of Fermi arcs in the quasicrystalline setting, which we deem Fermi-Bragg arcs, densely distributed lines connecting the band degeneracies and indexed by the Bragg peaks. Signatures of such surface states in quantum oscillations and the prospect of a fully quasicrystalline Weyl system are also discussed. The flexibility of our proposal brings new opportunities for realizing other gapless topological phases in aperiodic systems, paving the way for a significantly expanded role for topological band theory." @default.
- W4310286284 created "2022-11-30" @default.
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- W4310286284 date "2022-11-25" @default.
- W4310286284 modified "2023-09-29" @default.
- W4310286284 title "Quasicrystalline Weyl points and dense Fermi-Bragg arcs" @default.
- W4310286284 doi "https://doi.org/10.1103/physrevb.108.l121109" @default.
- W4310286284 hasPublicationYear "2022" @default.
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