| Issue |
Europhys. Lett.
Volume 35, Number 8, September II 1996
|
|
|---|---|---|
| Page(s) | 591 - 596 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00156-5 | |
| Published online | 01 September 2002 | |
Far-infrared response of quantum dots: filling factor dependence at high magnetic fields
Institut für Theoretische Physik, Universität
Regensburg, 93040 Regensburg, Germany
Received:
6
June
1996
Accepted:
15
July
1996
In recent experiments by Bollweg et al.
(Phys. Rev. Lett., 76 (1996) 2774) a novel feature was observed
in the far-infrared absorption spectra of quantum dots: the resonance frequency of the
low-lying 
mode exhibits small oscillations in dependence on the magnetic
field. By calculating the self-consistent far-infrared response of electrons in quantum
dots, we can give an explanation for this behavior. For high magnetic fields, the occupation
of electron states in the quantum dot can be related to a filling factor defined for the
density in the center of the dot. We trace back the oscillations in the mode
to an oscillatory filling factor dependence of the radial extension of the electron
density.
PACS: 73.20.Dx – Electron states in low-dimensional structures (including quantum wells, super lattices, layer structures, and intercalation compounds) / 73.20.Mf – Collective excitations (including plasmons and other charge-density excitations) / 71.45.Gm – Exchange, correlation, dielectric and magnetic functions, plasmons
© EDP Sciences, 1996
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