Abstract
An investigation is made of the absorption spectra of a GaAs(82 Å)/Al0.07Ga0.93As(37 Å) superlattice at 10 K in electric fields between 0 and 60 kV/cm. By comparing the experimental absorption spectra with calculations of the energies and oscillator strengths of transitions between states of the Wannier-Stark ladder it is established that in strong electric fields above-barrier states do not form a structureless continuum but a fan of states. Intersection of electric-field-localized electron states with the fan of above-barrier states leads to broadening, splitting, and nonmonotonic changes in the intensity of an intrawell transition band. The additional absorption band observed can be attributed to intrawell transitions between states in the left and right quantum wells of the superlattice.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 118, No. 4, 2000, pp. 911–922.
Original Russian Text Copyright © 2000 by Grigor’ev, Dorofeev, Litvinenko, Lysenko, Onishchenko, Leo, Rosam, Kohler.
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Grigor’ev, V.N., Dorofeev, O.V., Litvinenko, K.L. et al. Influence of above-barrier and edge states on absorption spectra of shallow GaAs/AlGaAs superlattices of finite length in strong electric fields. J. Exp. Theor. Phys. 91, 791–800 (2000). https://doi.org/10.1134/1.1326972
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DOI: https://doi.org/10.1134/1.1326972