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Electron–Electron Correlations in Square-Well Quantum Dots: Direct Energy Minimization Approach

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Abstract:

Electron–electron correlations in two-dimensional square-well quantum dots are investigated using the direct energy minimization scheme. Searches for groundstate charges and spin configurations are performed with varying the sizes of dots and the number of electrons. For a two-electron system, a standout difference between the configurations with and without counting correlation energy is demonstrated. The emergence and melting of Wigner-molecule-like structures arising from the interplay between the kinetic energy and Coulombic interaction energy are described. Electron–electron correlation energies and addition energy spectra are calculated, and special electron numbers related to peculiar effects of the square well are extracted.

Keywords: DIRECT ENERGY MINIMIZATION; ELECTRONIC STRUCTURE CALCULATIONS; QUANTUM DOTS; WIGNER MOLECULE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3924

Publication date: April 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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