Field-induced delocalization and Zener breakdown in semiconductor superlattices.
We investigate the energy spectrum and the electron dynamics of a band in a semiconductor superlattice as a function of the electric field. Linear optical spectroscopy shows that, for high fields, the well-known localization of the Bloch states is followed by a field-induced delocalization, associated with Zener breakdown. Using time-resolved measurements, we observe Bloch oscillations in a regime where they are damped by Zener breakdown.
Rosam
B
B
Institut fur Angewandte Photophysik, Technische Universitat Dresden, 01062 Dresden, Germany.
Meinhold
D
D
Löser
F
F
Lyssenko
V G
VG
Glutsch
S
S
Bechstedt
F
F
Rossi
F
F
Köhler
K
K
Leo
K
K