Energy Transfer in The Presence of Correlated and Uncorrelated Phonons

by Omer Goldberg

at Condensed Matter Theory Seminar

Wed, 15 Nov 2017, 13:30
Physics building (#54) room 207


The transport properties of nanoscale systems can be strongly affected even determined by the interaction between the transported particles and the vibrations of the system An important example is photosynthetic networks in which excitons generated by sunlight are transferred from one chromophores to another The interaction of these excitons with local vibrations is presumed to play a crucial role in the dynamics of the system We study the role vibrations play in the energy transfer through the simplest possible transfer network only two chromophores long where each chromophore is modeled by a non interacting quantum level coupled to vibrations By using a non equilibrium Green s functions technique for the full exciton vibration system we can treat the strong exciton vibration coupling regime In particular we compare between cases where the vibrations of each quantum level are either correlated global vibrations or uncorrelated local We find that the two cases exhibit qualitatively different energy transfer properties For global vibrations the energy current shows anti resonances which are due to interference between states with different polaron number Counter intuitively this interference feature increases with increasing temperature When the vibrations are uncorrelated the dominant feature is resonant exciton tunneling which is totally absent for the correlated case

Created on 13-11-2017 by Bar Lev, Yevgeny (ybarlev)
Updaded on 13-11-2017 by Bar Lev, Yevgeny (ybarlev)