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Proceedings Paper

Transition from miniband to Wannier-Stark states in GaAs-AlAs superlattices
Author(s): Klaus H. Schmidt; Alessandra D'Intino; Norbert Linder; M. Tuna; Gottfried H. Doehler; Holger T. Grahn; Klaus H. Ploog; K. Kawashima; Kenzo Fujiwara
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Paper Abstract

We have studied the field dependence of the absorption coefficient of three GaAs-AlAs superlattices using a new modulation technique, the wavelength modulated photocurrent spectroscopy. At small applied electric fields we observe transitions corresponding to the edges of the joint miniband density of states between electrons and heavy holes as well as light holes. At intermediate fields Franz-Keldysh oscillations appear at the lower and upper band edges of the heavy and light hole joint miniband. With further increasing electric field these oscillations transform gradually into Wannier-Stark ladder transitions. The experimentally observed features are well reproduced by numerical calculations.

Paper Details

Date Published: 3 September 1992
PDF: 11 pages
Proc. SPIE 1675, Quantum Well and Superlattice Physics IV, (3 September 1992); doi: 10.1117/12.137619
Show Author Affiliations
Klaus H. Schmidt, Univ. Erlangen-Nuernberg (Germany)
Alessandra D'Intino, Univ. Erlangen-Nuernberg (Germany)
Norbert Linder, Univ. Erlangen-Nuernberg (Germany)
M. Tuna, Univ. Erlangen-Nuernberg (Germany)
Gottfried H. Doehler, Univ. Erlangen-Nuernberg (Germany)
Holger T. Grahn, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Klaus H. Ploog, Max-Planck-Institut fuer Festkoerperforschung and Technische Hochs (Germany)
K. Kawashima, ATR Optical and Radio Communications Research Lab. (Japan)
Kenzo Fujiwara, ATR Optical and Radio Communications Research Lab. (Japan)

Published in SPIE Proceedings Vol. 1675:
Quantum Well and Superlattice Physics IV
Gottfried H. Doehler; Emil S. Koteles, Editor(s)

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