Oscillatory crossover from two-dimensional to three-dimensional topological insulators
Oscillatory crossover from two-dimensional to three-dimensional topological insulators
We investigate the crossover regime from three dimensional topological insulators $Bi_2Te_3$ and $Bi_2Se_3$ to two dimensional topological insulators with quantum spin Hall effect when the layer thickness is reduced. Using both analytical models and first-principles calculations, we find that the crossover occurs in an oscillatory fashion as a function of …