Strain-tunable topological quantum phase transition in buckled honeycomb lattices

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Abstract

Low-buckled silicene is a prototypical quantum spin Hall insulator with the topological quantum phase transition controlled by an out-of-plane electric field. We show that this field-induced electronic transition can be further tuned by an in-plane biaxial strain ε, owing to the curvature-dependent spin-orbit coupling (SOC): There is a Z 2 = 1 topological insulator phase for biaxial strain |ε| smaller than 0.07, and the band gap can be tuned from 0.7 meV for ε=+0.07 up to 3.0 meV for ε=-0.07. First-principles calculations also show that the critical field strength E c can be tuned by more than 113%, with the absolute values nearly 10 times stronger than the theoretical predictions based on a tight-binding model. The buckling structure of the honeycomb lattice thus enhances the tunability of both the quantum phase transition and the SOC-induced band gap, which are crucial for the design of topological field-effect transistors based on two-dimensional materials.

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Yan, J. A., Cruz, M. A. D., Barraza-Lopez, S., & Yang, L. (2015). Strain-tunable topological quantum phase transition in buckled honeycomb lattices. Applied Physics Letters, 106(18). https://doi.org/10.1063/1.4919885

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