February 2021

Research Feature

Here is a Research Feature article on our theory for detecting biexciton interactions via quantum light


Eric and Carlos's talks at the ICS

Last Friday's workshop on excitons is now available for viewing on YouTube:

Spectroscopy and Dynamics of Multi-exciton Processes 
(Click on link for video)
Carlos Silva, Georgia Institute of Technology
Eric Bittner, University of Houston
Matthew Sfeir, ASRC and The Graduate Center, CUNY
Laurens Siebbeles, Delft University of Technology 

Thanks to our speakers and participants! 

See you all at the next workshop on
March 19, "Quantum Dynamics of Excitons and Exciton-Light Interactions."

Initiative for the Theoretical Sciences
The Graduate Center, City University of New York
itsatcuny.org | Twitter | YouTube 

Live at the ICS!

Eric and Carlos, live at at virtual workshop on excitons!

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Mixed Quantum Classical Simulations of Charge-Transfer Dynamics in a Model Light-Harvesting Complex: I. Charge-Transfer Dynamics

We develop here a mixed quantum mechanical/molecular dynamics model to investigate charge-transfer dynamics in a set of large organic donor–bridge–acceptor triad molecules. Specifically, we are interested in the differences in electron and nuclear behavior relating to small changes in the molecular makeup of carotenoid–porphyrin–fullerene triads. Our model approximates excitation energies on the order of 1.9 eV which agree with absorption spectra for these triads and isolated porphyrins. Using electron population analysis, we monitor charge migration to the acceptor in time. Approximations of the charge transfer rates reveal ultrafast (picosecond scale) electron dynamics consistent with experimental literature

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Mixed quantum classical simulations of charge-transfer dynamics in a model light-harvesting complex: II. Transient Vibrational Analysis

Stochastic scattering theory for excitation induced dephasing: Time-dependent nonlinear coherent exciton lineshapes

Stochastic scattering theory for excitation induced dephasing: Comparison to the Anderson-Kubo lineshape

The molecular origin of Frenkel biexciton binding