When: Friday July 8 from 11:30 AM to 12:30 PM
Where: Cabot Division Room at Mallinckrodt
What: Johannes is up for group meeting:
"Title:
The Clean Energy Project - An Update
Abstract:
My presentation will discuss the current state of the Clean Energy Project,
our automated, high-throughput, in silico screening and design effort for
organic photovoltaic materials to be used in the next generation of
high-efficiency plastic solar cells. I will give a brief review on the
overall project and then focus on recent developments, in particular
considering our first result generations, their interpretation, and the
upcoming database."
--
Joel Yuen-Zhou
PhD candidate in Chemical Physics
Harvard University CCB,
12 Oxford St. Mailbox 107,
Cambridge, MA, USA.
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Probably of interest to people working on FMO,
Best,
Stephanie
Sent to you by quebe via Google Reader: The Physical Basis for
Long-lived Electronic Coherence in Photosynthetic Light Harvesting
Systems. (arXiv:1107.0322v1 [quant-ph]) via quant-ph updates on
arXiv.org by <a
href="http://arxiv.org/find/quant-ph/1/au:+Pachon_L/0/1/0/all/0/1">Leonardo
A. Pachon</a>, <a
href="http://arxiv.org/find/quant-ph/1/au:+Brumer_P/0/1/0/all/0/1">Paul
Brumer</a> on 7/4/11
The physical basis for observed long-lived electronic coherence in
photosynthetic light-harvesting systems is identified using an
analytically soluble model. Three physical features are found to be
responsible for their long coherence lifetimes: i) an {\it effective}
low temperature regime and its implicit non-Markovian character, ii)
the small energy gap between excitonic states, and iii) the small ratio
of the energy gap to the coupling between excitonic states. Using this
approach, we obtain decoherence times for a dimer model with FMO
parameters of $\approx$ 160 fs at 77 K and $\approx$ 80 fs at 277 K. As
such, significant oscillations are found to persist for 600 fs and 300
fs, respectively, in accord with the experiment and with previous
computations. Similar good agreement is found for PC645 at room
temperature, with oscillations persisting for 400 fs. The analytic
expressions obtained provide direct insight into the parameter
dependence of the decoherence time scales.
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