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Title: Mechanistic Regimes of Vibronic Transport in a Heterodimer and the Design Principle of Incoherent Vibronic Transport in Phycobiliproteins

Journal Article · · Journal of Physical Chemistry Letters
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [1]
  1. Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry and Chemical Biology; Canadian Inst. for Advanced Research, Toronto, ON (Canada). Bio-Inspired Solar Energy Program
  2. Vrije Univ., Amsterdam (Netherlands). Dept. of Physics and Astronomy; Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics; Canadian Inst. for Advanced Research, Toronto, ON (Canada). Bio-Inspired Solar Energy Program
  3. Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry and Chemical Biology
  4. Vrije Univ., Amsterdam (Netherlands). Dept. of Physics and Astronomy; Canadian Inst. for Advanced Research, Toronto, ON (Canada). Bio-Inspired Solar Energy Program

Following the observation of coherent oscillations in nonlinear spectra of photosynthetic pigment protein complexes, in particular, phycobilliproteins such as PC645, coherent vibronic transport has been suggested as a design principle for novel light-harvesting materials. Vibronic transport between energetically remote pigments is coherent when the presence of a vibration resonant with the electronic energy gap supports transient delocalization between the electronic excited states. We establish the mechanism of vibronic transport for a model heterodimer across a wide range of molecular parameter values. The resulting mechanistic map demonstrates that the molecular parameters of phycobiliproteins in fact support incoherent vibronic transport. This result points to an important design principle: Incoherent vibronic transport is more efficient than a coherent mechanism when energetic disorder exceeds the coupling between the donor and vibrationally excited acceptor states. Finally, our results suggest that the role of coherent vibronic transport in pigment protein complexes should be reevaluated.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001088
OSTI ID:
1470509
Journal Information:
Journal of Physical Chemistry Letters, Vol. 9, Issue 10; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (8)

Coupled excitation energy and charge transfer dynamics in reaction centre inspired model systems journal January 2019
Multi-level description of the vibronic dynamics of open quantum systems journal October 2019
Phonon-mediated excitation energy transfer in a detuned multi-sites system journal March 2019
Quantum dynamics of vibration-assisted excitation energy transfer in phycobiliprotein light-harvesting complex journal October 2019
Variety, the spice of life and essential for robustness in excitation energy transfer in light-harvesting complexes journal January 2020
Quantum coherences reveal excited-state dynamics in biophysical systems journal June 2019
Effect of an underdamped vibration with both diagonal and off‐diagonal exciton–phonon interactions on excitation energy transfer journal December 2018
Insights into Photosynthetic Energy Transfer Gained from Free-Energy Structure: Coherent Transport, Incoherent Hopping, and Vibrational Assistance Revisited journal March 2021