Absorption band shape of combined two-dimensio magnetoexciton-cyclotron resonance
The absorption band shape of the combined optical quantum transition with the creation of a two-dimensional magnetoexciton and with the simultaneous excitation of one back- ground electron between its Landau levels is discussed. The combined magnetoexciton- cyclotron resonance (MECR) quantum transi...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2008
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/a8b33e5edf8140de8f84c098d8bfa559 |
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| Sumario: | The absorption band shape of the combined optical quantum transition with the creation
of a two-dimensional magnetoexciton and with the simultaneous excitation of one back-
ground electron between its Landau levels is discussed. The combined magnetoexciton-
cyclotron resonance (MECR) quantum transitions are described within the frame of the model
of two-dimensional electron-hole system in a strong perpendicular magnetic field, taking into
account supplementary small concentration of background electrons resident on the lowest
Landau level (LLL). The concrete case of magnetoexciton composed by electron and hole on
their LLL and the accompanying cyclotron resonance with excitation of the background electron from the LLL to the first excited Landau level is considered. The position of the combined absorption band is shifted in comparison with the frequency of the magnetoexciton
band by the frequency of the electron cyclotron resonance. The maximal band width equals
the ionization potential l
I of the magnetoexciton, because participation of the third particle
side by side with the electron-hole pair permits to uncover its entire internal energy spectrum
beginning with the bottom of the magnetoexciton band and finishing with its ionization potential. The analytical formulas describing the absorption band shape in the vicinity of these two
limiting frequencies were deduced. The numerical calculations on the base of a general formula permitted us to obtain a full band shape, which has a monotonic decreasing form with a
maximal value near the frequency corresponding to the bottom of the magnetoexciton band
and tends linearly to zero near the second limiting frequency corresponding to the ionization
of magnetoexciton. This band shape is completely different from the case of the combined
exciton-cyclotron resonance quantum transitions with participation of the two-dimensional
Wannier-Mott exciton in quantum well structures revealed and discussed in references [1, 2].
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