Bloch-Redfield equations for modeling light-harvesting complexes
arXiv:1408.2726 · doi:10.1063/1.4907370
Abstract
We challenge the misconception that Bloch-Redfield equations are a less powerful tool than phenomenological Lindblad equations for modeling exciton transport in photosynthetic complexes. This view predominantly originates from an indiscriminate use of the secular approximation. We provide a detailed description of how to model both coherent oscillations and several types of noise, giving explicit examples. All issues with non-positivity are overcome by a consistent straightforward physical noise model. Herein also lies the strength of the Bloch-Redfield approach because it facilitates the analysis of noise-effects by linking them back to physical parameters of the noise environment. This includes temporal and spatial correlations and the strength and type of interaction between the noise and the system of interest. Finally we analyze a prototypical dimer system as well as a 7-site Fenna-Matthews-Olson (FMO) complex in regards to spatial correlation length of the noise, noise strength, temperature and their connection to the transfer time and transfer.
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Cited by in corpus (4)
- Modified Bloch-Redfield Master Equation for Incoherent Excitation of Multilevel Quantum Systems
- Quantifying Spatial Correlations of General Quantum Dynamics
- Signatures of spatially correlated noise and non-secular effects in two-dimensional electronic spectroscopy
- Minimalistic analytical approach to non-Markovian open quantum systems