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2006 | 110 | 3 | 379-387
Article title

The Nature of Potential Fluctuations in the MBE CdTe/CdMgTe Quantum Well in a Magnetic Field: Experiment and Theory

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EN
Abstracts
EN
Far infrared photoconductivity spectra of CdTe/Cd_{0.8}Mg_{0.2}Te quantum well uniformly n-type doped with iodine in barriers and in the well were investigated as a function of the magnetic field. The spectra were recorded for several fixed far infrared photon energies and peaks corresponding to intra donor transitions were observed. The magnetic field at which the peaks were observed was the same for all far infrared photon energies used. This is interpreted as an evidence of the presence of fluctuations of the electrostatic potential - quantum dots which reduce the dimensionality of the potential in which a shallow donor is placed. A characteristic size of the fluctuations was found to be of 23-25 nm and 30-40 nm. Theoretical calculations show a nonmonotonic dependence of the electron binding energy on the donor centre in such quantum dot, as a function of magnetic field. This explains why the position of experimentally observed peak is insensitive to far infrared photon energy used. Temperature evolution of spectra and the theoretical model proposed, indicate similarities between fluctuations in the two-dimensional structure investigated and fluctuations in bulk systems.
Keywords
Year
Volume
110
Issue
3
Pages
379-387
Physical description
Dates
published
2006-09
received
2006-06-17
References
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  • 6. B.I. Shklovskii, A.L. Efros, Electronic Properties of Doped Semiconductors, Springer-Verlag, Berlin 1984
  • 7. A.A. Avetisyan, A.P. Djotyan, E.M. Kazaryan, Phys. Status Solidi C, 2, 734, 2003
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv110n314kz
Identifiers
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