Instability inducing directed tunnelling of a single particle in a bipartite lattice

摘要: For a high-frequency-driven particle held in bipartite lattice with two different separations, and b, we construct analytical solutions which quantitatively describe the directed motions, investigate physical mechanism of selective tunnelling. It is shown that if effective tunnelling rates across b are same, system displays delocalization coherent destruction When adjusted to go through values same magnitude opposite signs, loses its stability enables be coherently manipulated. The quantitative results could useful for controlling transport characterization superlattice material.