Enhancement of Vibronic and Ground-State Vibrational Coherences in 2D Spectra of Photosynthetic Complexes
Citations Over TimeTop 1% of 2013 papers
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.
Related Papers
- → Analysis of the S2←S0 vibronic spectrum of the ortho-cyanophenol dimer using a multimode vibronic coupling approach(2015)14 cited
- → Intraband relaxation and dephasing of Frenkel exciton states in one-dimensional J-aggregates(2004)11 cited
- → Dephasing of excitons in ZnSe and ZnSe/ZnSxSe1−x quantum wells(1995)14 cited
- → Single vibronic level fluorescence spectra of pyrazine and their relation to vibronic coupling(1979)9 cited
- The Influence of Anticrossing of Exciton States on Exciton Relaxation in GaAs/A1GaAs Double Single Quantum Wells(1999)