Spin-density-functional theory of circular and elliptical quantum dots
نویسندگان
چکیده
منابع مشابه
Spin-Density-Functional Theory of Circular and Elliptical Quantum Dots
Using spin-density-functional theory, we study the electronic states of a two-dimensional parabolic quantum dot with up to N = 58 electrons. We observe a shell structure for the filling of the dot with electrons. Hund’s rule determines the spin configuration of the ground state, but only up to 22 electrons. At specific N , the ground state is degenerate, and a small elliptical deformation of th...
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Using density functional theory, we investigate fluctuations of the ground-state energy of spin-polarized, disordered quantum dots in the metallic regime. To compare to experiment, we evaluate the distribution of addition energies and find a convolution of the Wigner-Dyson distribution, expected for noninteracting electrons, with a narrower Gaussian distribution due to interactions. The third m...
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We use spin-density-functional theory to study the spacing between conductance peaks and the ground-state spin of 2D model quantum dots with up to 200 electrons. Distributions for different ranges of electron number are obtained in both symmetric and asymmetric potentials. The even/odd effect is pronounced for small symmetric dots but vanishes for large asymmetric ones, suggesting substantially...
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Denis Ullmo,1,2 Hong Jiang,1,3 Weitao Yang,3 and Harold U. Baranger1 1Department of Physics, Duke University, Durham, North Carolina 27708-0305, USA 2Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), 91405 Orsay Cedex, France 3Department of Chemistry, Duke University, Durham, North Carolina 27708-0354, USA (Received 21 January 2004; revised manuscript received 26 May 2004; publ...
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Kohn-Sham spin-density functional theory provides an efficient and accurate model to study electronelectron interaction effects in quantum dots, but its application to large systems is a challenge. Here an efficient method for the simulation of quantum dots using density-function theory is developed; it includes the particlein-the-box representation of the Kohn-Sham orbitals, an efficient conju...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1999
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.59.4604