Hi everyone,
We have group meeting today at 1.30pm in the division room.
*What:* Christoph Kreisbeck from the University of Regensburg will be
giving a talk
*Where: *Cabot division room*
When: TODAY, Friday April 20th 1.30-2.30pm **
**
Abstract:
Quantum transport through complex networks
*
There are di fferent regimes of quantum transport in complex networks
ranging from
purely coherent up to strongly dissipative dynamics. The latter regime is
relevant for
energy transfer in photosynthesis.
Laser spectroscopy experiments by Engel et al. (Nature 2007) and also
by Collini et
al. (Nature 2010) suggest that quantum coherent e ffects may be essential
in the energy
transfer in light-harvesting complexes despite their high operating
temperatures. To
reproduce the experimental results, the diffculty is to bring together two
seemingly con-
tradictory experimental observations: (i) strong dissipation inducing fast
thermalization
and (ii) long lived coherence in cross peak oscillations of the 2d spectra.
In this talk
I show that the structure of the coupling to the protein vibrations has
major ffects
on the dynamics in 2d-spectra. Under realistic structured spectral
densities, long lived
electronic coherence and strong dissipation does coexist in the FMO
light-harvesting
complex.
The numerical simulations of the 2d-spectra are done with the
hierarchical equations
of motion (HEOM) approach. We extend our GPU-HEOM, a graphics processing
unit
(GPU) implementation, to general structured spectral densities.
Best,
Stephanie
**
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