Dynamic Dipole–Dipole Interactions Between Excitons in Quantum Dots of Different Sizes

Matsueda, Hideaki; Leósson, Kristján; Xu, Zuyan; Hvam, Jørn Märcher; Ducommun, Y.; Hartmann, A.; Kapon, E.

doi:10.1109/tnano.2004.828559

Cited by 14 publications

(13 citation statements)

References 18 publications

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“…In addition to the traditional QA, i.e., assemblies of large organic molecules in chemistry [1,6], solid state physics [7] and biology [8,9], examples of such new types of aggregate are electronically excited atoms in optical lattices [10], ''molecules'' and ''crystals'' composed of quantum dots [11][12][13], assemblies of nanosize metallic particles [3,4], or molecules bound to DNA as a template [14]. On electronic excitation, the (transition) dipole-dipole interaction between such QMs leads to migration of dipole excitation through the aggregate.…”

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confidence: 99%

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Absorption Spectra of Quantum Aggregates Interacting via Long-Range Forces

Eisfeld

Briggs

2006

Phys. Rev. Lett.

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We present a simple formula by which the shape of the absorption spectrum of an aggregate of quantum "monomers" (cold atoms, molecules, quantum dots, nanoparticles, etc.) interacting via dipole-dipole forces can be calculated from the averaged spectrum of the quantum monomer itself. Spectral broadening, due to a wide variety of causes, is included explicitly so that the formula is applicable not only to the idealization of a discrete spectrum but also to the practical situation of a continuously broadened spectrum. In simple cases, analytic results are obtained showing the strong dependence of the aggregate spectrum on the precise nature of the broadening of the quantum monomer spectrum. The formula is compared with results of exact diagonalization of model aggregate Hamiltonians and with experiment.

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“…Taking the QM spectrum to be centered on E 0 and to have a finite width ÿ, it is clear from (12) that for E ÿ…”

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Absorption Spectra of Quantum Aggregates Interacting via Long-Range Forces

Eisfeld

Briggs

2006

Phys. Rev. Lett.

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“…The RDDDI shifts the excited energy level of each QD by an amount indicated as "dd" in Fig.2, as is the case of usual quantum resonance interaction [3]. Figure 2: Energy level shifts due to the RDDDI [1].…”

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confidence: 94%

“…This is suggestive of the RDDDI energy shift "d-d" indicated in Fig.2, because the energy of 0.3meV agrees with the estimation using eqn. (2) [1]. The origins of all the peaks are investigated in terms of the first quantized level in the conduction band in each QD, quantum wires at the pyramid center and edges, multielectrons and/or multiholes, multiexcitons, charged excitons, spin-spin interactions, and the RDDDI.…”

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Dynamic dipole-dipole interactions between excitons in quantum dots of different sizes

Matsueda

Leósson²,

Xu³

et al. 2005

International Quantum Electronics Conference, 2005.

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Microphotoluminescence spectra of GaAs/AlGaAs coupled quantum dots (QDs) are given, and proposed to be analyzed by our resonance dynamic dipoledipole interaction (RDDDI) model, based on parity inheritance and exchange of virtual photons among QDs of different sizes. * * * * * Recent developments in nanostructure technology and precision measurements make the resonance dynamic dipole-dipole interaction (RD-DDI) among electric dipoles each confined threedimensionally, i.e. in a quantum dot (QD), important. In this paper, a model of the coherence generating RDDDI between a couple of pyramidally shaped quantum dots of different sizes is developed in terms of virtual photons and parity inheritance [1]. This is important in practice, because so far no real QD pair could be fabricated in an exactly same size. Experimental results suggestive of the RDDDI between excitons in QDs of different sizes are given and proposed to be analyzed by this model . It is naturally expected that this result should be effective for the realization of quantum bits (qubits), quantum controlled not (CN) gates, swap gates, and a solid state quantum computer, as described elsewhere [2].A QD pair is approximated by a couple of two level systems having a total Hamiltonian H with the dipole-dipole interaction H dd .where suffix 0 denotes the non-interacting independent system. The state of the system is expressed either by the wave function (Ψ) or by the ket vectors | 0 i and | 0 j of the ground states (no exciton) at sites i and j respectively, and | 1 i , | 1 j of excited states (an exciton is created in each) as shown in Fig.1.The interaction energy of the RDDDI between a pair of QDs at sites i and j involving real or q |1 i

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Pyramidal Quantum Dots Grown by Organometallic Chemical Vapor Deposition on Patterned Substrates

Nano Science and Technolgy

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Dynamic Dipole–Dipole Interactions Between Excitons in Quantum Dots of Different Sizes

Cited by 14 publications

References 18 publications

Absorption Spectra of Quantum Aggregates Interacting via Long-Range Forces

Absorption Spectra of Quantum Aggregates Interacting via Long-Range Forces

Dynamic dipole-dipole interactions between excitons in quantum dots of different sizes

Pyramidal Quantum Dots Grown by Organometallic Chemical Vapor Deposition on Patterned Substrates

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