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High-Chern-number bands and tunable Dirac cones in β-graphyne

Guido van Miert, Cristiane Morais Smith, and Vladimir Juričić
Phys. Rev. B 90, 081406(R) – Published 25 August 2014
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Abstract

Graphynes represent an emerging family of carbon allotropes that recently attracted much interest due to the tunability of the Dirac cones in the band structure. Here, we show that the spin-orbit couplings in β-graphyne could produce various effects related to the topological properties of its electronic bands. Intrinsic spin-orbit coupling yields high- and tunable Chern-number bands, which may host both topological and Chern insulators, in the presence and absence of time-reversal symmetry, respectively. Furthermore, Rashba spin-orbit coupling can be used to control the position and the number of Dirac cones in the Brillouin zone. These findings suggest that spin-orbit-related physics in β-graphyne is very rich, and, in particular, that this system could provide a platform for the realization of a two-dimensional material with tunable topological properties.

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  • Received 19 May 2014
  • Revised 9 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.081406

©2014 American Physical Society

Authors & Affiliations

Guido van Miert, Cristiane Morais Smith, and Vladimir Juričić

  • Institute for Theoretical Physics, Centre for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands

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Issue

Vol. 90, Iss. 8 — 15 August 2014

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