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• W2022852081 endingPage "14090" @default.
• W2022852081 startingPage "14079" @default.
• W2022852081 abstract "We present a nonlocal theory of collective excitations in quantum-dot arrays. Selection rules, oscillator strengths, and Coulomb interactions inside a dot and between dots are discussed. The collective excitation energy is found to ``saturate'' for ${mathit{n}}_{0}$ (the number of electrons per dot) greater than 3. The depolarization energy shift in a quantum-dot array is found to be predominantly due to interdot coupling. We explain qualitatively the multiple branches and anticrossings recently observed in far-infrared experiments. We predict that anticrossings can occur only if ${mathit{n}}_{0}$>2. If ${mathit{n}}_{0}$ensuremath{le}2, there should be only one branch with positive B dispersion, and one branch with negative B dispersion, where B represents a perpendicular magnetic field. Multiple branches with positive (negative) B dispersions occur for larger ${mathit{n}}_{0}$. The use of left (right) -circularly-polarized light should result in signals predominantly from positive (negative) B dispersion branches, while signals from the opposite polarization branches should provide information on the coupling between positive and negative B dispersion branches." @default.
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• W2022852081 date "1991-06-15" @default.
• W2022852081 modified "2023-09-28" @default.
• W2022852081 title "Nonlocal theory of collective excitations in quantum-dot arrays" @default.
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• W2022852081 doi "https://doi.org/10.1103/physrevb.43.14079" @default.
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