ML登録者の皆さま、
今週末に下記セミナーを開催いたします。
奮ってご参加ください。
金賢得
〒606-8502
京都市左京区北白川追分町
京都大学 大学院理学研究科
化学専攻 量子化学研究室
e-mail:kim@kuchem.kyoto-u.ac.jp
TEL:075-753-4021
FAX:075-753-4000
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日時：11月4日(金）11:00AM より
場所：京都大学 理学部6号館571号室
http://theochem.kuchem.kyoto-u.ac.jp/map.htm
講演タイトル："A variational master equation approach to dissipative energy
transfer dynamics"
講演者：Dr. Ahsan Nazir, Junior Research Fellow, Imperial College, London
Nazir氏は10月30日から11月4日まで化学専攻に滞在します。
There will be a special lecture entitled, "A variational master equation
approach to dissipative energy transfer dynamics" given by Dr. Ahsan Nazir
from Imperial College, London on Nov. 4 at 11:00 am in Science Building VI,
Room 571. He will be staying in our laboratory from Oct. 30 to Nov. 4.
Attached please find the lecture abstract.
Title: A variational master equation approach to dissipative energy
transfer dynamics
Abstract: Recent experiments demonstrating signatures of quantum coherence
in the energy transfer dynamics of a variety of light-harvesting systems
[1] have sparked renewed interest in the theoretical modelling of energy
transfer processes. A major challenge remains the development of techniques
which allow one to probe the diverse parameter regimes relevant to such
systems. Master equation methods provide useful tools with which to
efficiently analyse energy transfer dynamics in the presence of an external
environment. However, they are often valid only in rather restrictive
parameter regimes, limiting their applicability in the present context.
Here, I shall present a versatile variational master equation approach to
the non-equilibrium dynamics of dissipative quantum systems, that allows
for the exploration of a wide range of parameter regimes within a single
formalism. Derived through the combination of a variationally-optimised
unitary transformation [2] and the time-local projection operator
technique, the master equation can be applied to a range of bath spectral
densities, and accounts for both non-Markovian and non-equilibrium
environmental effects [3]. Applying the formalism in the case of
excitation energy transfer, I shall show that while it correctly
reproduces Redfield [4], polaron [5], and Foerster [6] dynamics in the
appropriate limits, it can also be used in intermediate regimes where none
of these theories may be applicable. I shall also discuss applications in
a slightly different context, that of laser-driven semiconductor quantum
dots [7].
Variational master equations thus represent a promising avenue for the
exploration of dissipative dynamics in a variety of physical systems.
[1] See, for example, H. Lee, Y.-C. Cheng, and G. R. Fleming, Science 316,
1462 (2007); G. S. Engel et al., Nature 446, 782 (2007); E. Collini and G.
D. Scholes, Science 323, 369 (2009); E. Collini et al. Nature 463, 644
(2010); G. Panitchayangkoon et al., Proc. Natl. Acad. Sci. 107, 12766 (2010)
[2] R. Silbey and R. A. Harris, J. Chem. Phys. 80, 2615 (1984)
[3] D. P. S. McCutcheon and A. Nazir, J. Chem. Phys. 135, 114501 (2011)
[4] A. G. Redfield, Adv. Magn. Reson. 1, 1 (1965)
[5] S. Jang et al., J. Chem. Phys. 129, 101104 (2008); A. Nazir, Phys.
Rev. Lett. 103, 146404 (2009)
[6] Th. Foerster, Discuss. Faraday Soc. 27, 7 (1959)
[7] D. P. S. McCutcheon et al., Phys. Rev. B 84, 081305(R) (2011)
