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Title: Two-dimensional pentagonal crystals and possible spin-polarized Dirac dispersion relations

Based on first-principles calculations we show that the two-dimensional pentagonal (pt) structures, the compositions of pt-BN{sub 2}, pt-C, and pt-Fe{sub 2}S, are stable. As a common feature, they are composed of 3 components: 2 stretched honeycomb sublattices and 1 square sublattice, conferring flexibility of tailoring the properties peculiar to the graphene. Although the Dirac dispersion relation is removed in metallic pt-BN{sub 2} and insulating pt-C due to the hybridization of two honeycomb sublattices, it survives in pt-Fe{sub 2}S because of the suppression of such hybridization between different spins. As a result, in the dispersion relation of pt-Fe{sub 2}S spin-polarized and anisotropic Dirac cones occur. We suggest that such type of dispersion relation can be used to produce spin-filter effect by applying electric bias in a specific direction.
Authors:
; ; ;  [1]
  1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22271196
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; BORON NITRIDES; CRYSTAL STRUCTURE; CRYSTALS; DISPERSION RELATIONS; FLEXIBILITY; GRAPHENE; IRON SULFIDES; SPIN; SPIN ORIENTATION; TWO-DIMENSIONAL CALCULATIONS