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- W2009086985 abstract "The electron, hole, and exciton spectra in the strained quantum-dot molecule consisting of three vertically arranged type-II $mathrm{In}mathrm{P}∕{mathrm{In}}_{0.49}{mathrm{Ga}}_{0.51}mathrm{P}$ self-assembled quantum dots are modeled by the $mathbf{k}∙mathbf{p}$ theory. For the sake of simplicity, we consider dots of cylindrical shape, but take into account the anisotropy of the strain through the continuum mechanical model. For thick spacers, the strain leads to an upward shift of the lowest energies in all explored electron shells, but for spacers thinner than, say, the coupling length, the quantum mechanical coupling prevails, and downward shifts are observed. The magnitudes of both the energy shift and the coupling length vary with the quantum-dot height. For the holes, the interplay of strain and mixing enables binding at larger distances than for the electrons. The overlap of the hole clouds is basically established by means of the light holes, which are confined by the strain in the spacer between the dots and may efficiently couple the heavy-hole states, which are localized inside the quantum dots. Similar to electrons, the exciton lowest-energy states of different angular momenta, as computed by an exact-diagonalization approach, exhibit overshoots on the single-quantum-dot levels. Good agreement is found with experiment on the spatial location of electrons and holes in the triple-quantum-dot molecules." @default.
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- W2009086985 date "2004-11-03" @default.
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- W2009086985 title "Binding of electrons, holes, and excitons in symmetric strained<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>In</mml:mi><mml:mi mathvariant=normal>P</mml:mi><mml:mo>∕</mml:mo><mml:msub><mml:mi mathvariant=normal>In</mml:mi><mml:mn>0.49</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>Ga</mml:mi><mml:mn>0.51</mml:mn></mml:msub><mml:mi mathvariant=normal>P</mml:mi></mml:mrow></mml:math>triple quantum-dot molecules" @default.
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- W2009086985 doi "https://doi.org/10.1103/physrevb.70.195302" @default.
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