Phononic Weyl nodal straight lines in MgB2
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DOI: 10.1103/physrevb.101.024301
Abstract: Based on first-principles calculations, we predict that the superconductor ${\mathrm{MgB}}_{2}$ with an ${\mathrm{AlB}}_{2}$-type centrosymmetric lattice hosts the so-called phononic topological Weyl nodal lines (PTWNLs) in its bulk phonon spectrum. These PTWNLs can be viewed as… read more here.
Keywords: weyl; weyl nodal; straight lines; lines mgb2 ... See more keywords
Weyl nodal surfaces
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DOI: 10.1103/physrevb.97.075120
Abstract: We consider three-dimensional fermionic band theories that exhibit Weyl nodal surfaces defined as two-band degeneracies that form closed surfaces in the Brillouin zone. We demonstrate that topology ensures robustness of these objects under small perturbations… read more here.
Keywords: band; topology; nodal surfaces; weyl nodal ... See more keywords
Symmetry-enforced band crossings in trigonal materials: Accordion states and Weyl nodal lines
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DOI: 10.1103/physrevmaterials.3.124204
Abstract: Nonsymmoprhic symmetries, such as screw rotations or glide reflections, can enforce band crossings within high-symmetry lines or planes of the Brillouin zone. When these band degeneracies are close to the Fermi energy, they can give… read more here.
Keywords: weyl nodal; crossings trigonal; band crossings; trigonal materials ... See more keywords