M. Ershov
Department of Physics and Astronomy, Georgia State University, Atlanta,
GA 30303
H. Ruda and A. Shik
Energenius Centre for Advanced
Nanotechnology, University of Toronto, Toronto M5S 3E3, Canada
A. G. U. Perera
Department of Physics and Astronomy, Georgia State University, Atlanta,
GA 30303
ABSTRACT
A theory of the transient spectroscopy of quantum well (QW) structures under a
large applied bias is presented. An analytical model of the initial part of the
transient current is proposed. The time constant of the transient current
depends not only on the emission rate from the QWs, as is usually assumed, but
also on the subsequent carrier transport across QWs. Numerical simulation was
used to confirm the validity of the proposed model, and to study the transient
current on a large time scale. It is shown that the transient current is influenced
by the nonuniform distribution of the electric field and related effects, which
results in a step-like behavior of the current. A procedure of extraction of
the QW emission time from the transient spectroscopy experiments is suggested. . © 1999 American Institute of Physics.
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