Variable Range Hopping and Electrical Conductivity along the DNA Double Helix

Yu, Zhi-Gang; Song, Xueyu

doi:10.1103/physrevlett.86.6018

Cited by 204 publications

(171 citation statements)

References 23 publications

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“…This expression generalizes the hopping function adopted in previous works, 18,20,21,31,32 which implicitly assumed =1/ 2 ͑i.e., t n,n±1 Ӎ t 0 cos n,n±1 ͒ for one-dimensional chains. As a matter of fact one usually gets Ͼ 1 in realistic conditions.…”

Section: B Effective Hamiltonianmentioning

confidence: 99%

Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling

Maciá

2007

Phys. Rev. B

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In this work we consider the combined effect of helical structure and base-pair twist motion on charge transfer through duplex DNA at low temperatures. We present a fully analytical treatment of charge-lattice coupled dynamics in terms of nearest-neighbor tight-binding equations describing the propagation of the charge through an effective linear lattice for certain frequency values. The corresponding effective hopping terms include both helicoidal and dynamical effects in a unified way. Although base-pair motion generally reduces -stack overlapping, the coupling to certain normal modes gives rise to a significant improvement of the Landauer conductance.

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Section: B Effective Hamiltonianmentioning

confidence: 99%

Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling

Maciá

2007

Phys. Rev. B

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“…1 More recently, this behavior has been found in completely different systems, sich as high-T c cuprate oxides, 2 conjugated polymers, 3,4 and DNA. 5 Experimentally, it has been recognized that ␥ can take on the discrete values ␥ Ϸ 0.25, 0.33, and 0.50. Shortly after the observations of this behavior, Mott 6 presented an explanation based on so-called variable-range hopping ͑VRH͒ between localized states.…”

Section: Introductionmentioning

confidence: 99%

Scaling of current distributions in variable-range hopping transport on two- and three-dimensional lattices

et al. 2005

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Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nl providing details and we will investigate your claim. From extensive computer simulations of variable-range hopping ͑VRH͒ transport of charges on regular twoand three-dimensional lattices with random site energies we calculate the average contribution to the total current of hops over a certain distance and with a certain hop energy. We find that the resulting current distribution is a universal function of scaled distance and energy variables. We discuss this scaling in the light of the original arguments of Mott and percolation arguments to explain the temperature dependence of the VRH conductivity.

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“…4 Equation ͑3͒ generalizes the function adopted in some previous works, which implicitly assumed =1/ 2 ͑i.e., t Ӎ t 0 cos n,nϮ1 ͒. 25,27,28,44,45 When describing the phonon dynamics in DNA one can disregard the inner degrees of freedom of the bases, since we can separate the fast vibrational motions of atoms about their equilibrium positions from the slower motions of molecular groups. In this work we shall focus on the low-frequency dominant twist mode, hence keeping the DNA radius constant.…”

Section: Dna Model Descriptionmentioning

confidence: 99%

π−πorbital resonance in twisting duplex DNA: Dynamical phyllotaxis and electronic structure effects

Maciá

2009

Phys. Rev. B

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The presence of synchronized, collective twist motions of the Watson-Crick base pairs in DNA duplexes ͑helicoidal standing waves͒ can efficiently enhance the -orbital overlapping between nonconsecutive base pairs via a long-range, phonon-correlated tunneling effect. The resulting structural patterns are described within the framework of dynamical phyllotaxis, providing a realistic treatment which takes into account both the intrinsic three-dimensional, helicoidal geometry of DNA, and the coupling between the electronic degrees of freedom and double-helix DNA molecular dynamics at low frequencies. The main features of the resulting electronic band structures are discussed for several resonance frequencies of interest, highlighting the possible biophysical implications of the obtained results.

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Variable Range Hopping and Electrical Conductivity along the DNA Double Helix

Cited by 204 publications

References 23 publications

Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling

Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling

Scaling of current distributions in variable-range hopping transport on two- and three-dimensional lattices

π−πorbital resonance in twisting duplex DNA: Dynamical phyllotaxis and electronic structure effects

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