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000022138 245__ $$aTopological phases of Bi(111) bilayer in an external exchange field
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000022138 500__ $$3POF3_Assignment on 2016-02-29
000022138 500__ $$aWe acknowledge very helpful discussions with Emil Prodan, Sheng Li, Klaus Koepernik, and Marjana Lezaic. This work was supported by the HGF-YIG Programme VH-NG-513 and by the DFG through Research Unit 912 and Grant No. HE3292/7-1. Computational resources were provided by the Julich Supercomputing Centre.
000022138 520__ $$aUsing first-principles methods, we investigate topological phase transitions as a function of exchange field in a Bi(111) bilayer. Evaluation of the spin Chern number for different magnitudes of the exchange field reveals that when the time-reversal symmetry is broken by a small exchange field, the system enters the time-reversal broken topological insulator phase, introduced by Yang et al. [Phys. Rev. Lett. 107, 066602 (2011)]. After a metallic phase in the intermediate region, the quantum anomalous Hall phase with a nonzero Chern number emerges at a sufficiently large exchange field. We analyze the phase diagram from the viewpoint of the evolution of the electronic structure, edge states, and transport properties and demonstrate that different topological phases can be distinguished by the spin polarization of the edge states as well as spin or charge transverse conductivity.
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