P. Carpena et al., ELECTRONIC-SPECTRUM OF QUANTUM-DELTA-WELLS SUPERLATTICES IN AN ELECTRIC-FIELD, Physical review. B, Condensed matter, 56(23), 1997, pp. 14929-14932
We study one-dimensional periodic chains of quantum 6 wells, centering
our attention on the properties of the electronic spectrum in the pre
sence of an electric field. We study the field dependence of the quasi
bound and resonant states of the system, which we define clearly. The
spectrum, whose absolute behavior depends on the symmetry of the poten
tial, is universal if an appropriate origin of energy is chosen. The f
ield finally transforms the spectrum into a continuous one. We study a
lso the formation of Wannier-Stark ladders. Finally, we show that in s
uperlattices, the quasibound levels are never degenerate.