Two-subband system in quantizing magnetic field: Probing many-body gap by non-equilibrium phonons
Apalkov, V.M.; Portnoi, M.E.
Date: 2002
Journal
Physica E: Low-Dimensional Systems and Nanostructures
Publisher
Elsevier
Publisher DOI
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Abstract
We study the many-body effects in a two-subband quasi-two-dimensional electron system in a quantizing magnetic field at filling factor three. A manifestation of these effects in the phonon absorption spectroscopy is discussed. The electron system is mapped onto a two-level system with the separation between levels determined by the ...
We study the many-body effects in a two-subband quasi-two-dimensional electron system in a quantizing magnetic field at filling factor three. A manifestation of these effects in the phonon absorption spectroscopy is discussed. The electron system is mapped onto a two-level system with the separation between levels determined by the intersubband splitting and the cyclotron energy. The electron–electron interaction enhances the excitation gap, which exists at all values of the interlevel splitting. This results in a single-peak structure of the phonon absorption rate as a function of magnetic field, instead of the double-peak structure for non-interacting electrons.
Physics and Astronomy
Faculty of Environment, Science and Economy
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