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The effect of structural disorder under bias voltage on the transmission
properties of a non-interacting electron across multibarrier systems
As) is exhaustively studied by a computational model
using exact Airy function formalism and the transfer-matrix technique. In
ordered systems we study the effect of bias voltage on miniband structure.
For disordered structures we investigate the transmission coefficient.
Different types of eigenstates are obtained, those having a very low
Lyapunov exponent close to the resonant energy and those with high slope in
other region. Commuting resonance energy is theoretically demonstrated in
this paper, the obtained values are in good agreement with the existing
We examine numerically the effect of quasiperiodicity in
the nature of the states in Fibonacci semiconductor superlattices by means
of the transfer matrix formalism. We are interested in the
GaAs/AlxGa1 − x As layers, having identical thickness, where the aluminium
concentration x takes, two different values. We have found that each miniband
of the periodic superlattice splits in several sub-minibands, that is small
minigaps appear. We demonstrate that the origin of these small inner
minigaps is due to the loss of long-range quantum coherent of the electrons
wave. The corresponding electronic spectrum shows a high fragment. The
states having transmission coefficient close to zero in the minibands can be
viewed as consisting of singular localised states.
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