We recently proposed effective normal modes for excitonically coupled aggregates that exactly transform the energy transfer Hamiltonian into a sum of one-dimensional Hamiltonians along the effective normal modes. Identifying physically meaningful vibrational motions that maximally promote vibronic mixing suggested an interesting possibility of leveraging vibrational-electronic resonance for mediating selective energy transfer. Here, we expand on the effective mode approach, elucidating its iterative nature for successively larger aggregates, and extend the idea of mediated energy transfer to larger aggregates. We show that energy transfer between electronically uncoupled but vibronically resonant donor–acceptor sites does not depend on the intermediate site energy or the number of intermediate sites. The intermediate sites simply mediate electronic coupling such that vibronic coupling along specific promoter modes leads to direct donor–acceptor energy transfer, bypassing any intermediate uphill energy transfer steps. We show that the interplay between the electronic Hamiltonian and the effective mode transformation partitions the linear vibronic coupling along specific promoter modes to dictate the selectivity of mediated energy transfer with a vital role of interference between vibronic couplings and multi-particle basis states. Our results suggest a general design principle for enhancing energy transfer through synergistic effects of vibronic resonance and weak mediated electronic coupling, where both effects individually do not promote efficient energy transfer. The effective mode approach proposed here paves a facile route toward four-wavemixing spectroscopy simulations of larger aggregates without severely approximating resonant vibronic coupling.
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14 May 2022
Research Article|
May 12 2022
Vibronic resonance along effective modes mediates selective energy transfer in excitonically coupled aggregates
Special Collection:
Time-resolved Vibrational Spectroscopy
Sanjoy Patra
;
Sanjoy Patra
Solid State and Structural Chemistry Unit, Indian Institute of Science
, Bangalore, Karnataka 560012, India
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Vivek Tiwari
Vivek Tiwari
a)
Solid State and Structural Chemistry Unit, Indian Institute of Science
, Bangalore, Karnataka 560012, India
a)Author to whom correspondence should be addressed: vivektiwari@iisc.ac.in
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a)Author to whom correspondence should be addressed: vivektiwari@iisc.ac.in
Note: This paper is part of the JCP Special Topic on Time-Resolved Vibrational Spectroscopy.
J. Chem. Phys. 156, 184115 (2022)
Article history
Received:
February 20 2022
Accepted:
April 25 2022
Citation
Sanjoy Patra, Vivek Tiwari; Vibronic resonance along effective modes mediates selective energy transfer in excitonically coupled aggregates. J. Chem. Phys. 14 May 2022; 156 (18): 184115. https://doi.org/10.1063/5.0088855
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