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An alternative method for the exact calculation of Wannier–Stark localization in superlattices

✍ Scribed by Y Ergun; R Amca; I Sokmen; H Sari; N Balkan

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
197 KB
Volume
29
Category
Article
ISSN
0749-6036

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✦ Synopsis

We present an alternative method for the exact calculations of the Wannier-Stark (WS) localization in a long periodic potential corresponding to a (50 Å/30 Å) GaAs/Ga 0.7 Al 0.3 As superlattice. We show that the electric field dependence of the electron wavefunction has unique localization dynamics. One interesting prediction is a small effect involving the change of the dipole field with increasing WS field. It is argued that this may give rise to parasitic effects in Bloch oscillations and, therefore, to noise in coherent terahertz emission.

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