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Electromodulated reflectance study of self-assembled Ge/Si quantum dots

Author(s): Yakimov Andrew | Nikiforov Aleksandr | Bloshkin Aleksei | Dvurechenskii Anatolii

Journal: Nanoscale Research Letters ISSN 1931-7573
Volume: 6; Issue: 1; Start page: 208; Date: 2011;
Original page

ABSTRACT
Abstract We perform an electroreflectance spectroscopy of Ge/Si self-assembled quantum dots in the near-infrared and in the mid-infrared spectral range. Up to three optical transitions are observed. The low-energy resonance is proposed to correspond to a band-to-continuum hole transition in the Ge valence band. The other two modulation signals are attributed to the spatially direct transitions between the electrons confined in the L and Δ(4) valleys of the Ge conduction band, and the localized hole states at the Γ point.