Multi-Scale Exciton and Electron Transfer in Multi-Level Donor-Acceptor System
arXiv:1404.7816 · doi:10.1088/1751-8121/aa81fd
Abstract
We study theoretically the noise-assisted quantum exciton (electron) transfer (ET) in bio-complexes consisting of a single-level electron donor and an acceptor which has a complicated internal structure, and is modeled by many electron energy levels. Interactions are included between the donor and the acceptor energy levels and with the protein-solvent noisy environment. Different regions of parameters are considered, which characterize (i) the number of the acceptor levels, (ii) the acceptor \band-width", and (iii) the amplitude of noise and its correlation time. Under some conditions, we derive analytical expressions for the ET rate and efficiency. We obtain equal occupation of all levels at large times, independently of the structure of the acceptor band and the noise parameters, but under the condition of non-degeneracy of the acceptor energy levels. We discuss the multi-scale dynamics of the acceptor population, and the accompanying effect of quantum coherent oscillations. We also demonstrate that for large number of levels in the acceptor band, the efficiency of ET can be close to 100%, for both downhill and uphill transitions and for sharp and at redox potentials.
33 pages, 12 figures. Title changed and new figures added. Published version
References in corpus (12)
- Environment-Assisted Quantum Transport
- Vibrational vs. electronic coherences in 2D spectrum of molecular systems
- The fundamental role of quantized vibrations in coherent light harvesting by cryptophyte algae
- Decoherence in qubits due to low-frequency noise
- Impact of environmentally induced fluctuations on quantum mechanically mixed electronic and vibrational pigment states in photosynthetic energy transfer and 2D electronic spectra
- Coherent exciton dynamics in the presence of underdamped vibrations
- Superradiance Transition in Photosynthetic Light-Harvesting Complexes
- Quantum mechanical approach to decoherence and relaxation generated by fluctuating environment
- Non-Gaussian dephasing in flux qubits due to 1/f-noise
- Temporal evolution of resonant transmission under telegraph noise
- Non-Hermitian approach for modeling of noise-assisted quantum electron transfer in photosynthetic complexes
- Noise-assisted quantum electron transfer in photosynthetic complexes