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Volumn 114, Issue 22, 2015, Pages

Topological Crystalline Insulator Phase in Graphene Multilayers

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTAL SYMMETRY; ELECTRIC INSULATORS; ENERGY GAP; GRAPHENE; MULTILAYERS; SEMICONDUCTOR QUANTUM WELLS; SEMICONDUCTOR QUANTUM WIRES;

EID: 84935880025     PISSN: 00319007     EISSN: 10797114     Source Type: Journal    
DOI: 10.1103/PhysRevLett.114.226802     Document Type: Article
Times cited : (40)

References (57)
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    • At high energies there are additional interlayer coupling terms that do not conserve the "Dirac" momentum (Equation presented) that appears in Eq. (1) [57]. At the (large) interlayer rotation angles of interest here, however, these terms merely renormalize the carrier velocity (Equation presented) [57] in the low-energy theory Eq. (1) and they thus do not appear explicitly
    • At high energies there are additional interlayer coupling terms that do not conserve the "Dirac" momentum (Equation presented) that appears in Eq. (1) [57]. At the (large) interlayer rotation angles of interest here, however, these terms merely renormalize the carrier velocity (Equation presented) [57] in the low-energy theory Eq. (1) and they thus do not appear explicitly.
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    • See Supplemental Material at for a discussion of the topological invariant in the low-energy model
    • See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevLett.114.226802 for a discussion of the topological invariant in the low-energy model.
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    • Pairs of boundary modes with opposite (Equation presented) eigenvalues evidently do not contribute to (Equation presented) and can increase the number of boundary modes above (Equation presented)
    • Pairs of boundary modes with opposite (Equation presented) eigenvalues evidently do not contribute to (Equation presented) and can increase the number of boundary modes above (Equation presented).
  • 53
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    • In a graphene bilayer rotated by angle (Equation presented) from a commensurate angle (Equation presented), regions with size of the order (Equation presented) appear, that have approximately SE-even stacking. There, the described topological modes can be observed if their spatial extent (Equation presented) is smaller than those regions. For (Equation presented) with (Equation presented) [39] this is fulfilled when (Equation presented)
    • In a graphene bilayer rotated by angle (Equation presented) from a commensurate angle (Equation presented), regions with size of the order (Equation presented) appear, that have approximately SE-even stacking. There, the described topological modes can be observed if their spatial extent (Equation presented) is smaller than those regions. For (Equation presented) with (Equation presented) [39] this is fulfilled when (Equation presented).


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