Untitled

HARIGAYA, KIKUO

doi:10.1142/s021797929900250

Cited by 5 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The connectivity of the branching points is equal to three so that D58 has a threefold symmetry around its central core. It consists of three dendrons The phenyl rings define sites for a network model that describes the dynamics of Frenkel excitons [5][6][7][8][9][10][11][12] . Each site x = 1, ..., N is occupied by a two-level system that accounts for the electronic properties of a phenyl ring.…”

Section: A Exciton Hamiltonianmentioning

confidence: 99%

“…Let |x denote the first excited state of the xth two-level system and ω x the corresponding energy. Within the local basis {|x }, the exciton dynamics is governed by a tightbinding Hamiltonian written as [5][6][7][8][9][10][11][12] (in unit = 1)…”

Section: A Exciton Hamiltonianmentioning

confidence: 99%

“…In that context, it has been suggested that excitonmediated energy transport could be exploited to design artificial light-harvesting complexes [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] . The main idea consists in the functionalization of the terminal groups by chromophores that favor light harvesting.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Disorder-enhanced exciton delocalization in an extended dendrimer

Pouthier

2014

Phys. Rev. E

View full text Add to dashboard Cite

The exciton dynamics in a disordered extended dendrimer is investigated numerically. Because a homogeneous dendrimer exhibits few highly degenerate energy levels, a dynamical localization arises when the exciton is initially located on the periphery. However, it is shown that the disorder lifts the degeneracy and favors a delocalization-relocalization transition. Weak disorder enhances the delocalized nature of the exciton and improves any quantum communication, whereas strong disorder prevents the exciton from propagating in accordance with the well-known Anderson theory.

show abstract

Section: A Exciton Hamiltonianmentioning

confidence: 99%

Section: A Exciton Hamiltonianmentioning

confidence: 99%

See 1 more Smart Citation

Disorder-enhanced exciton delocalization in an extended dendrimer

Pouthier

2014

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…11,12 In addition, it has been pointed out that the interaction between the electronic states and the molecular vibrations is important to cause an efficient energy transfer. 13,14 In these circumstances, how energy transfer occurs in real systems is still a big standing problem. In particular, whether the energy transfers in a unit of exciton or in a unit of electron and hole separately has not been scrutinized yet.…”

Section: Introductionmentioning

confidence: 99%

Light-harvesting function through one-by-one electron and hole transfer in a methane-lithium system

Kodama

Ohno

2006

The Journal of Chemical Physics

View full text Add to dashboard Cite

Carrying out a semiclassical molecular dynamics simulation of a CH4-Li2 system by using the time-dependent local density approximation of the time-dependent density functional theory, we find that one-by-one electron and hole transfer takes place from CH4 to Li2 when an electron is excited in CH4. Probability of the transfer is low when the molecules are fixed, but it increases when the molecules are freely relaxed or Li2 has 1 eV of initial velocity.

show abstract

“…Several previous studies on the Cayley-tree type dendritic systems have elucidated that the exciton distribution in each exciton state is spatially well segmented in each generation because of the decoupling of -conjugation at the meta-branching points ͑meta-substituted benzene rings͒ in dendrimers [1][2][3][4][5] or the reduction of intermolecular interaction at the branching points in dendritic aggregates. [6][7][8][9] Further, the exciton-phonon coupling has been found to be important for such efficient step-by-step exciton migration ͑relaxation͒ via exciton states using the quantum master equation approach involving exciton-phonon coupling in dendritic aggregate models. 6 -9,13 As a result, the overlap between exciton distributions ͑squared exciton wave functions͒ in adjacent generations is predicted to be essential for such exciton migration.…”

Section: Introductionmentioning

confidence: 99%

Exciton migration dynamics in a dendritic molecule: Quantum master equation approach using ab initio molecular orbital configuration interaction method

Nakano

Takahata

Yamada

et al. 2004

The Journal of Chemical Physics

View full text Add to dashboard Cite

We investigate the exciton migration dynamics in a dendritic molecular model composed of pi-conjugation linear-leg units (acetylenes and diacetylene) and a benzene ring (branching point) using the quantum master equation approach with the ab initio molecular orbital (MO) configuration interaction (CI) method. The efficient migration of exciton from short-length linear legs (acetylenes) to long-length linear leg (diacetylene) via a benzene ring is observed. As predicted in previous studies, the exciton (electron and hole) distributions are relatively well localized in each generation segmented by the meta-branching point (meta-substituted benzene ring) though the electron and hole distributions are delocalized and are somewhat spatially different from each other within each generation. It is found that the excitons localized in the generation composed of short linear legs occupy in higher-lying exciton states, while those in the generation composed of long linear legs do in lower-lying ones. These features suggest the decoupling of pi-conjugation at the meta-branching point. On the other hand, the relaxation effect between exciton states is found to be caused by the exciton-phonon coupling, in which the existence of common configurations (electron-hole pairs) in CI wave functions between adjacent exciton states (having primary distributions on short and long linear-leg regions, respectively) is important for the relaxation between their exciton states. This feature indicates the importance of partial penetration of pi-conjugation through the meta-substituted benzene ring in excited states for such exciton migration.

show abstract

Untitled

Cited by 5 publications

References 0 publications

Disorder-enhanced exciton delocalization in an extended dendrimer

Disorder-enhanced exciton delocalization in an extended dendrimer

Light-harvesting function through one-by-one electron and hole transfer in a methane-lithium system

Exciton migration dynamics in a dendritic molecule: Quantum master equation approach using ab initio molecular orbital configuration interaction method

Contact Info

Product

Resources

About