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Title: Spin-1 Dirac-Weyl fermions protected by bipartite symmetry

We propose that bipartite symmetry allows spin-1 Dirac-Weyl points, a generalization of the spin-1/2 Dirac points in graphene, to appear as topologically protected at the Fermi level. In this spirit, we provide methodology to construct spin-1 Dirac-Weyl points of this kind in a given 2D space group and get the classification of the known spin-1 systems in the literature. We also apply the workflow to predict two new systems, P3m1-9 and P31m-15, to possess spin-1 at K/K′ in the Brillouin zone of hexagonal lattice. Their stability under various strains is investigated and compared with that of T{sub 3}, an extensively studied model of ultracold atoms trapped in optical lattice with spin-1 also at K/K′.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (China)
  2. (China)
  3. (BNLMS), Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
22493289
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 143; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMS; BRILLOUIN ZONES; COMPARATIVE EVALUATIONS; FERMI LEVEL; FERMIONS; GRAPHENE; HEXAGONAL LATTICES; SPACE GROUPS; SPIN; STRAINS; TOPOLOGY; TRAPPING; TRIGONAL LATTICES