Theory of transient spectroscopy of multiple quantum well structures

Details Theory of transient spectroscopy of multiple quantum well structures Theory of transient spectroscopy of multiple quantum well structures

1999-06-16

arxiv.org/abs/cond-mat/9906255v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, to be published in J. Appl. Phys

Scientific paper

10.1063/1.370921

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 larger 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.

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