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Symmetry reduction in multiband Hamiltonians for semiconductor quantum dots: The role of interfaces and higher energy bands

Tomic, S and Vukmirović, N 2011, 'Symmetry reduction in multiband Hamiltonians for semiconductor quantum dots: The role of interfaces and higher energy bands' , Journal of Applied Physics, 110 (5) , 053710.

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    Abstract

    The role of interfaces and higher bands on the electronic structure of embedded semiconductor quantum dots (QDs) was investigated. The term in the multiband k�p Hamiltonian that captures the effect of interface band mixing was derived starting from the microscopic theory. It was shown, analytically and numerically, that, with such a term included, the right symmetry of the QD system can be captured. It leads to splitting of otherwise degenerate energy levels of the order of several meV. The inclusion of additional higher bands beyond the ones from the standard eight-band model also leads to the reduction of symmetry from an artificially high one to the true atomistic symmetry of the system, however their quantitative effect is weaker. These results prove that the multiband k.p Hamiltonians are fully capable of describing the correct symmetry of a QD.

    Item Type: Article
    Themes: Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre
    Journal or Publication Title: Journal of Applied Physics
    Publisher: American Institute of Physics
    Refereed: Yes
    ISSN: 00218979
    Depositing User: Prof Stanko Tomic
    Date Deposited: 18 Oct 2011 16:37
    Last Modified: 20 Aug 2013 18:15
    URI: http://usir.salford.ac.uk/id/eprint/18490

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