Strain Effect on Silicene Quantum Dot Embedded in Silicane*

A new design for silicene quantum dots (SiQDs) embedded in silicane probably makes magnetism and band gap of the SiQD being controllable by hydrogen. In this paper, the strain effect for the embedded SiQD in silicane was investigated by a first-principles method. The homogeneous strain and two types of uniaxial strains are considered. As expected, the band gap can be tuned by strains and the behavior of the band gap are distinct while applied with different strain types. However, the magnetism is still determined by the size and shape of the SiQD. Strain cannot alter the magnetism of the embedded SiQD. The variation of band gap of various shapes of embedded SiQD also have different behaviors under strains.