Document Detail


Electronic states in heterostructures formed by ultranarrow layers.
MedLine Citation:
PMID:  23044439     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Low-energy electronic states in heterostructures formed by ultranarrow layers (single or several monolayers in thickness) are studied theoretically. The host material is described within the effective mass approximation and the effect of ultranarrow layers is taken into account within the framework of the transfer matrix approach. Using the current conservation requirement and the inversion symmetry of an ultranarrow layer, the transfer matrix is evaluated through two phenomenological parameters. The binding energy of localized state, the reflection (transmission) coefficient for the single ultranarrow layer case, and the energy spectrum of the superlattice are determined by these parameters. The spectral dependency of absorption due to photoexcitation of electrons from localized states into minibands of the superlattice is determined by the ultranarrow layer characteristics. Such a dependency can be used for verification of the transfer matrix and should modify the characteristics of optoelectronic devices with ultranarrow layers. Comparison with experimental data shows that the effective mass approach is not valid for the description of ultranarrow layers.
Authors:
F T Vasko; V V Mitin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-09
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  24     ISSN:  1361-648X     ISO Abbreviation:  J Phys Condens Matter     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  445010     Citation Subset:  -    
Affiliation:
Department of Electrical Engineering, University at Buffalo, Buffalo, NY 14260-1920, USA.
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