High-buckled stanene with a topologically nontrivial energy gap.
ENERGY gaps (Physics)
SCANNING tunneling microscopy
DENSITY functional theory
Journal of Physics: D Applied Physics; 7/29/2021, Vol. 54 Issue 30, p1-6, 6p
We demonstrate an efficient way of tuning the atomic buckling in stanene to open a topologically nontrivial energy gap. By tuning the growth kinetics, we obtain an unexpected high-buckled stanene on the Bi(111) substrate. Scanning tunneling microscopy study combined with density functional theory calculation confirms that the stanene is a distorted 1 × 1 structure with a high-buckled Sn in every three 1 × 1 unit cells. The high-buckled stanene favors a large band inversion at the Γ point, and the spin–orbit coupling opens a topologically nontrivial energy gap. This study provides an alternate way to tune the topology of monolayer topological materials. [ABSTRACT FROM AUTHOR]
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