The effects of biaxial strain and electric field on the electronic properties in stanene

Abstract

The effects of biaxial strain (−2% < ε < 6%) and electric field (E-field) on structural and electronic properties in stanene are systematically investigated by first-principles calculations. We find that, with the increase of biaxial strain, the conduction bands at the high symmetric Γ point in the first Brillouin zone shift towards the Fermi level in stanene. In addition, the biaxial strain also affects the position of Dirac cone. The E-field changes the band dispersions near the Γ with a small band gap opening at the K point. Remarkably, the band gap opening in stanene can be effectively modulated by the external E-field and strain. These results present a flexible method toward modulating the electronic and band properties of stanene and shed light on its experimental applications.