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Franz–Keldysh oscillations at the above-barrier miniband in a GaAs/AlxGa1 − xAs superlattice

✍ Scribed by M. Ando; M. Nakayama; H. Nishimura; K. Fujiwara

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
84 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

We report on the observation of the Franz-Keldysh oscillations associated with the secondelectron and heavy-hole minibands, in which the second-electron miniband lies above the barrier potential, in a GaAs(7.0 nm)/Al 0.1 Ga 0.9 As (3.5 nm) superlattice by using electroreflectance spectroscopy. The reduced mass estimated from the Franz-Keldysh oscillations is consistent with that estimated from the miniband-dispersion relation based on the effective mass approximation around a zero-electric field, and becomes heavier with an increase in the electric field. The electric-field dependence of the reduced mass correlates with the localization of the electron envelope function. We discuss these results from an envelopefunction forms calculated by a transfer-matrix method.

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Franz–Keldysh oscillations at the miniba
Franz–Keldysh oscillations at the miniband edge in a GaAs/AlxGa1 −xAs superlattice
✍ M. Ando; M. Nakayama; H. Nishimura; H. Schneider; K. Fujiwara 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 106 KB

We have systematically measured the electroreflectance spectra of a GaAs (7.0 nm)/Al 0.1 Ga 0.9 As (3.5 nm) superlattice at various electric fields to investigate Franz-Keldysh (FK) oscillations. In the low-field regime, we clearly observe the FK oscillations toward the low-energy side of the M 1 cr