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Binding energy of a hydrogenic donor impurity in an ellipsoidal finite‐potential quantum dot
Author(s) -
Barati M.,
Rezaei G.,
Vahdani M. R. K.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642543
Subject(s) - quantum dot , binding energy , impurity , physics , atomic physics , radius , perturbation theory (quantum mechanics) , ellipsoid , oblate spheroid , condensed matter physics , curse of dimensionality , chemistry , quantum mechanics , machine learning , computer security , astronomy , computer science
In this article, the binding energy of a hydrogenic donor impurity in weakly oblate Ellipsoidal Quantum Dot (EQD), using the perturbation theory within the framework of effective mass approximation, is investigated. In this regard, the binding energies of 1 S , 2 S and 2 P 0 states for GaAs/Al x Ga 1 –x As structures, as functions of the dot radius and ellipticity constant, are calculated. Results show that variations of binding energies of a hydrogenic impurity with respect to the dot dimension are similar to the case of Spherical Quantum Dot (SQD). In addition, it is found that the binding energy is inversely proportional to the ellipticity constant. This behavior is more profound for 2 P 0 state, where, depending on the dot's dimensionality and ellipticity, the binding energy may become negative. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)