WANNIER-STARK STATES IN NANOSTRUCTURES

We study the effects of a longitudinal-external-electric field on the electronic properties of an open-quantum-dot superlattice. These struc tures present the formation of two different gaps, one associated with the periodicity of the structure imposed upon the 1D mode and the oth er associated to the destructive interference between the 1D mode and the quantum-dot states. The transmission coefficients between two quas i-two dimensional reservoirs through these structures are calculated. The electric field presents different regimes: at weak fields the tran smission peaks associated to the tunneling through the confined dot st ates show an energy shift and a progressive decline of the transmissio n. At moderate fields the transmission bands become sharp and the tran smission peaks to one. As the electric field increases the anti-resona nce gaps widen. Finally, at large electric fields, the Wannier-Stark l evels are completely formed and the transmission is characterized by a series of relatively equally spaced peaks.