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Chin. Phys., 2007, Vol. 16(1): 272-276    DOI: 10.1088/1009-1963/16/1/046
CROSS DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev  

Extended Holstein polaron model for charge transfer in dry DNA

Wang Yia, Liu Taob, Wang Ke-Linc
a Institute of Thin Films and Nano Materials, Wuyi University, Jiangmen 529020, China;Department of Astronomy and Applied Physics,University of Science and Technology of China, Hefei 230026, China; b School of Science, Southwest University of Science and Technology, Mianyang 621002, China; c School of Science, Southwest University of Science and Technology, Mianyang 621002, China;Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026, China
Abstract  The variational method is applied to the study of charge transfer in dry DNA by using an extended Holstein small polaron model in two cases: the site-dependent finite-chain discrete case and the site-independent continuous one. The treatments in the two cases are proven to be consistent in theory and calculation. Discrete and continuous treatments of Holstein model both can yield a nonlinear equation to describe the charge migration in an actual long-range DNA chain. Our theoretical results of binding energy Eb, probability amplitude of charge carrier \phi and the relation between energy and charge--lattice coupling strength are in accordance with the available experimental results and recent theoretical calculations.
Keywords:  variational method      Holstein polaron model      dry DNA      charge transfer     
Received:  05 September 2005      Published:  01 February 2007
PACS:  87.14.G- (Nucleic acids)  
  36.20.Fz (Constitution (chains and sequences))  
  87.10.-e (General theory and mathematical aspects)  
  87.15.K- (Molecular interactions; membrane-protein interactions)  
  87.15.N- (Properties of solutions of macromolecules)  
Fund: Project supported by the National Nature Science Foundation of China (Grant No 50272063) and \ the Foundation for Excellent Talents of Anhui Province, China (Grant No 2001Z016).

Cite this article: 

Wang Yi, Liu Tao, Wang Ke-Lin Extended Holstein polaron model for charge transfer in dry DNA 2007 Chin. Phys. 16 272

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