Electronic structure of silicene
L. C. Lew Yan Voon†
       
Phase diagram for silicene in exchange field M and electric field E z . The insulator phases are indexed by the Chern and spin-Chern numbers ( C , Cs ). Reprinted figure with permission from M. Ezawa, 2012 Phys. Rev. Lett. 109 055502. Copyright (2012) by the American Physical Society.