Titel
Enhancement of Vibronic and Ground-State Vibrational Coherences in 2D Spectra of Photosynthetic Complexes
Autor*in
Aurélia Chenu
Faculty of Mathematics and Physics, Charles University in Prague
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Abstract
A vibronic-exciton model is applied to investigate the recently proposed mechanism of enhancement of coherent oscillations due to mixing of electronic and nuclear degrees of freedom. We study a dimer system to elucidate the role of resonance coupling, site energies, vibrational frequency and energy disorder in the enhancement of vibronic-exciton and ground-state vibrational coherences, and to identify regimes where this enhancement is significant. For a heterodimer representing two coupled bachteriochloropylls of the FMO complex, long-lived vibronic coherences are found to be generated only when the frequency of the mode is in the vicinity of the electronic energy difference. Although the vibronic-exciton coherences exhibit a larger initial amplitude compared to the ground-state vibrational coherences, we conclude that, due to the dephasing of the former, both type of coherences have a similar magnitude at longer population time.
Stichwort
Chemical physicsComputational biophysicsQuantum mechanicsOptical spectroscopy
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
Scientific Reports
Band
3
Publication
Springer Nature
Erscheinungsdatum
2013
Zugänglichkeit
Rechte
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