Evidence for exciton-exciton binding in a molecular aggregate

Chakrabarti, Aparna; Schmidt, A.; Valencia, V. S.; Fluegel, B.; Mazumdar, S.; Armstrong, Neal R.; Peyghambarian, N.

doi:10.1103/physrevb.57.r4206

Cited by 21 publications

(17 citation statements)

References 21 publications

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“…The next important question concerning the n-string peaks in PA and TPA experiments, is fully clarified for the biexciton (the most important case) and confirms some conclusions of previous works [5,6,[13][14][15][16]. The intensity of the transition from the one exciton to the biexciton decreases with the binding energy and, for sufficient binding energy, becomes independent of the system size.…”

Section: Discussionsupporting

confidence: 85%

“…These compounds are claimed to be the ideal ones to get biexcitons but, without convincing demonstration for the moment -possibly be due to a too small binding energy [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Only a few theoretical investigations of excitonic strings in organic compounds have been done [4][5][6][12][13][14][15][16][17][18]. Most of them are based on exact diagonalizations of small clusters using different kinds of model Hamiltonians depending on the system under consideration [4][5][6]13].…”

Section: Introductionmentioning

confidence: 99%

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Excitonic strings in one-dimensional organic compounds

Pleutin

2000

Phys. Rev. B

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Important questions concern the existence of excitonic strings in organic compounds and their signatures in the photophysics of these systems. A model in terms of hard core bosons is proposed to study this problem in one dimension. Mainly the cases with two and three particles are studied for finite and infinite lattices, where analytical results are accessible. It is shown that if biexcitonic states exist, three-excitonic and even, n-excitonic strings, at least in a certain range of parameters, will exist. Moreover, the behavior of the transitions from one exciton to the biexciton is fully clarified. The results are in agreement with exact finite cluster diagonalizations of several model Hamiltonians.

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Section: Discussionsupporting

confidence: 85%

“…These compounds are claimed to be the ideal ones to get biexcitons but, without convincing demonstration for the moment -possibly be due to a too small binding energy [5,6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Excitonic strings in one-dimensional organic compounds

Pleutin

2000

Phys. Rev. B

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“…Such interactions can lead to two exciton bound states, called biexcitons. Experimental evidences for biexciton states were found in molecular aggregates [244]. Interestingly, no signature of biexcitons is found in the J-aggregate.…”

Section: Coherent and Non-coherent Exciton Transfermentioning

confidence: 94%

Excitons in Carbonic Nanostructures

Demchenko

2019

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Unexpectedly bright photoluminescence emission can be observed in materials incorporating inorganic carbon when their size is reduced from macro–micro to nano. At present, there is no consensus in its understanding, and many suggested explanations are not consistent with the broad range of experimental data. In this Review, I discuss the possible role of collective excitations (excitons) generated by resonance electronic interactions among the chromophore elements within these nanoparticles. The Förster-type resonance energy transfer (FRET) mechanism of energy migration within nanoparticles operates when the composing fluorophores are the localized electronic systems interacting at a distance. Meanwhile, the resonance interactions among closely located fluorophores may lead to delocalization of the excited states over many molecules resulting in Frenkel excitons. The H-aggregate-type quantum coherence originating from strong coupling among the transition dipoles of adjacent chromophores in a co-facial stacking arrangement and exciton transport to emissive traps are the basis of the presented model. It can explain most of the hitherto known experimental observations and must stimulate the progress towards their versatile applications.

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“…Some comparisons can already be made. The work in ( 17 ) gives, for instance, values of t = 80 meV and U / t ≈ 4 for epitaxially grown metal-halogen-phthalocyanine H-aggregates (fluoroaluminum phthalocyanine) based on transient absorption measurements; no bound biexcitons were observed in a similar J-aggregate system (chloroindium phthalocyanine).…”

Section: Resultsmentioning

confidence: 99%