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 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 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.
- Received 19 May 2014
- Revised 9 August 2014
DOI:https://doi.org/10.1103/PhysRevB.90.081406
©2014 American Physical Society