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Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals

Author(s): Bradlyn, Barry; Cano, Jennifer; Wang, Zhijun; Vergniory, MG; Felser, C; et al

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dc.contributor.authorBradlyn, Barry-
dc.contributor.authorCano, Jennifer-
dc.contributor.authorWang, Zhijun-
dc.contributor.authorVergniory, MG-
dc.contributor.authorFelser, C-
dc.contributor.authorCava, Robert J-
dc.contributor.authorBernevig, B Andrei-
dc.identifier.citationBradlyn, Barry, Cano, Jennifer, Wang, Zhijun, Vergniory, MG, Felser, C, Cava, RJ, Bernevig, B Andrei. (2016). Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals. SCIENCE, 353 (10.1126/science.aaf5037en_US
dc.description.abstractIn quantum field theory, we learn that fermions come in three varieties: Majorana, Weyl, and Dirac. Here, we show that in solid-state systems this classification is incomplete, and we find several additional types of crystal symmetry-protected free fermionic excitations. We exhaustively classify linear and quadratic three-, six-, and eight-band crossings stabilized by space group symmetries in solid-state systems with spin-orbit coupling and time-reversal symmetry. Several distinct types of fermions arise, differentiated by their degeneracies at and along high-symmetry points, lines, and surfaces. Some notable consequences of these fermions are the presence of Fermi arcs in non-Weyl systems and the existence of Dirac lines. Ab initio calculations identify a number of materials that realize these exotic fermions close to the Fermi level.en_US
dc.rightsAuthor's manuscripten_US
dc.titleBeyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystalsen_US
dc.typeJournal Articleen_US

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