The influence of polaron–phonon interaction on absorption spectra in molecular crystals

Čevizović, Dalibor; Zeković, Slobodan; Ivić, Zoran

doi:10.1016/j.cplett.2009.08.055

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…Improved theory was presented by Alexander and Krumhansl who interpreted the IR absorption spectra of ACN [4] in terms of the one-dimensional small polaron (SP) model. Subsequent theoretical investigation [4,5,7,9,10] has shown that the SP theory can explain, in principle, some of the open questions in the problem of transport dynamics of IMO. Nevertheless, even so improved Davydov theory, being entirely based on pure 1D models, can not be fully reliable for the objective description of the excitation transfer in the realistic Q1D structures which are composed of the two (ACN, DNA), three (α-helix) or more coupled MCs (some conjugated polymers and Q1D conductors).…”

Section: Introductionmentioning

confidence: 99%

On the vibron nature in the system of two parallel macromolecular chains: The influence of interchain coupling

Čevizović

Ivić

Galović

et al. 2016

Physica B: Condensed Matter

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We studied the properties of the intramolecular vibrational excitation (vibron) at finite temperature in a system which consists of two parallel macromolecular chains. It was assumed that vibron interacts exclusively with dispersionless optical phonons and the whole system is considered to be in thermal equilibrium. Particular attention has been paid to the examination of the impact of the temperature and strength of the interchain coupling on the small polaron crossover. For that purpose we employed partial dressing method which enables the study of the degree of the phonon dressing of the vibron excitations in a wide area of system parameter space. We found that in the non-adiabatic regime the degree of dressing as a function of coupling constant continuously increases reflecting the smooth transition of the slightly dressed, practically free vibron, to a heavily dressed one: small polaron. As "adiabaticity" rises this transition becomes increasingly steeper, and finally, in the adiabatic limit, a discontinuous "jump" of the degree of dressing is observed. The interchain coupling manifests itself through the increase of the effective adiabatic parameter of the system.

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Section: Introductionmentioning

confidence: 99%

On the vibron nature in the system of two parallel macromolecular chains: The influence of interchain coupling

Čevizović

Ivić

Galović

et al. 2016

Physica B: Condensed Matter

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“…In this section, the previous formalism is applied for describing the exciton energy corrections and the dressed phonon normal modes induced by the exciton-phonon interaction. To proceed, reduced parameters will be used [53]. First, the adiabaticity will be measured by the standard parameter B = 2 / 0 .…”

Section: Resultsmentioning

confidence: 99%

“…The corresponding energy ˆ k = k + δ k exhibits a correction δ k . It is a signature of the dressing mechanism whose parameter dependence can be interpreted using the small polaron theory [53,54]. Within this formalism, the dressing favors two main effects.…”

Section: A Quantum States Of the Dressed Excitonmentioning

confidence: 99%

Exciton-phonon system on a star graph: A perturbative approach

Yalouz

Pouthier

2016

Phys. Rev. E

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Based on the operatorial formulation of the perturbation theory, the properties of an exciton coupled with optical phonons on a star graph are investigated. Within this method, the dynamics is governed by an effective Hamiltonian, which accounts for exciton-phonon entanglement. The exciton is dressed by a virtual phonon cloud whereas the phonons are clothed by virtual excitonic transitions. In spite of the coupling with the phonons, it is shown that the energy spectrum of the dressed exciton resembles that of a bare exciton. The only differences originate in a polaronic mechanism that favors an energy shift and a decay of the exciton hopping constant. By contrast, the motion of the exciton allows the phonons to propagate over the graph so that the dressed normal modes drastically differ from the localized modes associated to bare phonons. They define extended vibrations whose properties depend on the state occupied by the exciton that accompanies the phonons. It is shown that the phonon frequencies, either red shifted or blue shifted, are very sensitive to the model parameter in general, and to the size of the graph in particular.

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Vibron Self-trapping in Quasi-One-Dimensional Biomolecules: Non-adiabatic Polaron Approach

Čevizović¹

2022

Nonlinear Dynamics of Nanobiophysics

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The influence of polaron–phonon interaction on absorption spectra in molecular crystals

Cited by 6 publications

References 35 publications

On the vibron nature in the system of two parallel macromolecular chains: The influence of interchain coupling

On the vibron nature in the system of two parallel macromolecular chains: The influence of interchain coupling

Exciton-phonon system on a star graph: A perturbative approach

Vibron Self-trapping in Quasi-One-Dimensional Biomolecules: Non-adiabatic Polaron Approach

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