FAR-INFRARED RESPONSE OF QUANTUM DOTS - FILLING FACTOR DEPENDENCE AT HIGH MAGNETIC-FIELDS

Citation
T. Darnhofer et al., FAR-INFRARED RESPONSE OF QUANTUM DOTS - FILLING FACTOR DEPENDENCE AT HIGH MAGNETIC-FIELDS, Europhysics letters, 35(8), 1996, pp. 591-596
Citations number
18
Categorie Soggetti
Physics
Journal title
ISSN journal
02955075
Volume
35
Issue
8
Year of publication
1996
Pages
591 - 596
Database
ISI
SICI code
0295-5075(1996)35:8<591:FROQD->2.0.ZU;2-9
Abstract
In recent experiments by Bollweg et al. (Phys. Rev. Lett., 76 (1996) 2 774) a novel feature was observed in the far-infrared absorption spect ra of quantum dots: the resonance frequency of the low-lying omega(-) 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 hig h magnetic fields, the occupation of electron states in the quantum do t can be related to a filling factor defined for the density in the ce nter of the dot. We trace back the oscillations in the omega(-) mode t o an oscillatory filling factor dependence of the radial extension of the electron density.