https://doi.org/10.1140/epjb/e2017-80048-1
Regular Article
Perfect quantum excitation energy transport via single edge perturbation in a complete network
1 Department of Physics, Isfahan University of Technology, 84156-83111 Isfahan, Iran
2 School of Physics, Institute for Research in Fundamental Sciences (IPM), 19395-5531 Tehran, Iran
3 Department of Applied Physics and COMP CoE, Aalto University School of Science, P.O. Box 11000, 00076 Aalto, Espoo, Finland
4 Departments of Mathematical Sciences and Physics, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
a
e-mail: vahidsalari742@gmail.com
Received: 18 January 2017
Received in final form: 19 April 2017
Published online: 14 June 2017
We consider quantum excitation energy transport (EET) in a network of two-state nodes in the Markovian approximation by employing the Lindblad formulation. We find that EET from an initial site, where the excitation is inserted to the sink, is generally inefficient due to the inhibition of transport by localization of the excitation wave packet in a symmetric, fully-connected network. We demonstrate that the EET efficiency can be significantly increased up to ≈100% by perturbing hopping transport between the initial node and the one connected directly to the sink, while the rate of energy transport is highest at a finite value of the hopping parameter. We also show that prohibiting hopping between the other nodes which are not directly linked to the sink does not improve the efficiency. We show that external dephasing noise in the network plays a constructive role for EET in the presence of localization in the network, while in the absence of localization it reduces the efficiency of EET. We also consider the influence of off-diagonal disorder in the hopping parameters of the network.
Key words: Statistical and Nonlinear Physics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2017
