Papers › Electric-field-induced Z2 topological phase transition in strained single bilayer Bi(111)
Electric-field-induced Z2 topological phase transition in strained single bilayer Bi(111)
Hikaru Sawahata, Naoya Yamaguchi, Fumiyuki Ishii
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For controlling the critical electric fields of the topological phase transition in single bilayer Bi(111), we investigated topological phases in a strained system through first-principles calculations. We found a quadratic band touching semimetallic state at tensile strain ϵ=0.5%. Around this strain, the topological phase can be switched to a trivial insulator by an infinitesimal electric field. The positions at which Dirac cones appear in the electric-field-induced topological phase transition changed for the strain ϵ>0.5% and ϵ<0.5%. Our results indicate that this topological phase transition could be applied to novel spintronic devices.
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