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Автор Yu V Skrypnyk
Автор J H Park
Автор B I Min
Дата выпуска 2000-04-24
dc.description A single substitutional impurity in a two-dimensional electron system is studied on the basis of the hybrid Anderson model with s-d coupling only between neighbouring sites. Analytic expressions for local densities of states (DOS) for the impurity d orbitals, d<sub> z <sup>2</sup> </sub> and d<sub> x <sup>2</sup> - y <sup>2</sup> </sub> , and for the s orbitals at the impurity and neighbouring host sites are determined. Special emphasis is put on the appearance of the well-defined resonance states and the antiresonance dips in the spectra, which are discussed in connection with the Fano phenomena. In contrast to the simple s-d Anderson model with the on-site coupling, it is demonstrated that the sharp resonance can be formed by increasing the coupling between the impurity and the host system, and that the resonance energy is shifted towards the band centre where the Van Hove singularity of the host DOS is present.
Формат application.pdf
Издатель Institute of Physics Publishing
Название Spectral characteristics induced by a single impurity in a two-dimensional system
Тип paper
DOI 10.1088/0953-8984/12/16/305
Electronic ISSN 1361-648X
Print ISSN 0953-8984
Журнал Journal of Physics: Condensed Matter
Том 12
Первая страница 3817
Последняя страница 3834
Аффилиация Yu V Skrypnyk; Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
Аффилиация J H Park; Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
Аффилиация B I Min; Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
Выпуск 16

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