Electric-field-induced <i>Z</i> <sub>2</sub> topological phase transition in strained single bilayer Bi(111)

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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 $��=0.5$%. 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 $��>0.5$% and $��<0.5$%. Our results indicate that this topological phase transition could be applied to novel spintronic devices.

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