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Geometrical effects on energy transfer in disordered open quantum systems

Author(s): Mohseni, Masoud; Shabani, Alireza; Lloyd, Seth; Omar, Yasser; Rabitz, Herschel

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Abstract: We explore various design principles for efficient excitation energy transport in complex quantum systems. We investigate energy transfer efficiency in randomly disordered geometries consisting of up to 20 chromophores to explore spatial and spectral properties of small natural/artificial Light-Harvesting Complexes (LHC). We find significant statistical correlations among highly efficient random structures with respect to ground state properties, excitonic energy gaps, multichromophoric spatial connectivity, and path strengths. These correlations can even exist beyond the optimal regime of environment-assisted quantum transport. For random configurations embedded in spatial dimensions of 30 angstrom or 50 angstrom, we observe that the transport efficiency saturates to its maximum value if the systems contain around 7 or 14 chromophores, respectively. Remarkably, these optimum values coincide with the number of chlorophylls in the Fenna-Matthews-Olson protein complex and LHC II monomers, respectively, suggesting a potential natural optimization with respect to chromophoric density. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
Publication Date: 28-May-2013
Electronic Publication Date: 29-May-2013
Citation: Mohseni, M, Shabani, A, Lloyd, S, Omar, Y, Rabitz, H. (2013). Geometrical effects on energy transfer in disordered open quantum systems. JOURNAL OF CHEMICAL PHYSICS, 138 (10.1063/1.4807084
DOI: doi:10.1063/1.4807084
ISSN: 0021-9606
EISSN: 1089-7690
Pages: 204309-1 - 204309-13
Type of Material: Journal Article
Version: Final published version. This is an open access article.

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