Energy transport in dendrimers

Supritz, C.; Engelmann, A.; Reineker, P.

doi:10.1016/j.jlumin.2006.01.005

Cited by 12 publications

(14 citation statements)

References 3 publications

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“…Let |r stand for the first excited state of the rth two-level system and¯ω 0 the corresponding energy. The set of orthogonal vectors {|r } defines a local basis that entirely generates the one-exciton Hilbert space E. Within this basis, the exciton dynamics is governed by a tight-binding Hamiltonian written as [31][32][33][34][35][36][37][38] …”

Section: B Exciton Hamiltonianmentioning

confidence: 99%

“…A dendrimer behaves as an artificial light-harvesting complex able to convert the energy of a radiation into a chemical fuel. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] To proceed, the main idea consists in the functionalization of the terminal groups by chromophores that are responsible for light harvesting. The capture of light generates electronic excitons that propagate along the dendrons.…”

Section: Introductionmentioning

confidence: 99%

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Exciton localization-delocalization transition in an extended dendrimer

Pouthier

2013

The Journal of Chemical Physics

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Exciton-mediated quantum state transfer between the periphery and the core of an extended dendrimer is investigated numerically. By mapping the dynamics onto that of a linear chain, it is shown that a localization-delocalization transition arises for a critical value of the generation number G(c) ≈ 5. This transition originates in the quantum interferences experienced by the excitonic wave due to the multiple scatterings that arise each time the wave tunnels from one generation to another. These results suggest that only small-size dendrimers could be used for designing an efficient quantum communication protocol.

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Section: B Exciton Hamiltonianmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exciton localization-delocalization transition in an extended dendrimer

Pouthier

2013

The Journal of Chemical Physics

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“…where t = Tr L −1 0 ρ(0) is the the average trapping time for the initial density matrix ρ(0), and L 0 = L sys + L trap + L dissip is the new Liouville superoperator in the absence of decay. schematic diagram of a two-generation three-fold dendrimer [19].…”

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confidence: 99%

Generic Mechanism of Optimal Energy Transfer Efficiency: A Scaling Theory of the Mean First-Passage Time in Exciton Systems

Silbey

Cao

2013

Phys. Rev. Lett.

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An asymptotic scaling theory is presented using the conceptual basis of trapping-free subspace (i.e., orthogonal subspace) to establish the generic mechanism of optimal efficiency of excitation energy transfer in light-harvesting systems. A quantum state orthogonal to the trap will exhibit noise-assisted transfer, clarifying the significance of initial preparation. For such an initial state, the efficiency is enhanced in the weak damping limit (⟨t⟩ ∼ 1/Γ), and suppressed in the strong damping limit (⟨t⟩ ∼ Γ), analogous to Kramers turnover in classical rate theory. An interpolating expression ⟨t⟩ = A/Γ + B + CΓ quantitatively describes the trapping time over the entire range of the dissipation strength, and predicts the optimal efficiency at Γ(opt) ∼ J for homogenous systems. In the presence of static disorder, the scaling law of transfer time with respect to dephasing rate changes from linear to square root, suggesting a weaker dependence on the environment. The prediction of the scaling theory is verified in a symmetric dendrimer system by numerically exact quantum calculations. Though formulated in the context of excitation energy transfer, the analysis and conclusions apply in general to open quantum processes, including electron transfer, fluorescence emission, and heat conduction.

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“…Especially we do not find a remarkable redshift of the lowest absorption peak with growing dendrimer size. The investigation of the density of states which is not shown here for lack of space shows that the peripheral molecules again dominate the spectra [10].…”

Section: Absorption Spectra For Extended Dendrimersmentioning

confidence: 86%

Optical absorption in dendrimers

Supritz

Engelmann

Reineker

2004

Journal of Luminescence

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Dendrimers are highly branched molecules, which are expected to be useful, for example, as efficient artificial light harvesting systems in nano-technological applications. There are two different classes of dendrimers: compact dendrimers with constant distance between neighboring branching points throughout the macromolecule and extended dendrimers, where this distance increases from the system periphery to the center. We investigate the linear absorption spectra of these dendrimer types using the Frenkel exciton concept. The electron-phonon interaction is taken into account by introducing a heat bath that interacts with the exciton in a stochastic manner. r

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Energy transport in dendrimers

Cited by 12 publications

References 3 publications

Exciton localization-delocalization transition in an extended dendrimer

Exciton localization-delocalization transition in an extended dendrimer

Generic Mechanism of Optimal Energy Transfer Efficiency: A Scaling Theory of the Mean First-Passage Time in Exciton Systems

Optical absorption in dendrimers

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