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arXiv 0901.3432cond-mat.softcond-mat.other
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溶剂中生物分子导线的电荷输运:桥接分子动力学和模型哈密顿方法

Charge transport through bio-molecular wires in a solvent: Bridging molecular dynamics and model Hamiltonian approaches

R. Gutierrez, R. Caetano, P. B. Woiczikowski, T. Kubar, M. Elstner, G. Cuniberti

摘要:

我们提出了一种基于量子/经典分子动力学(MD)模拟和模型哈密顿方法相结合的混合方法来描述在溶剂存在下通过具有可变长度的生物分子导线的电荷输运。我们的方法的核心包括在生物分子的电子结构的映射,从密度泛函为基础的紧束缚计算分子结构沿MD轨迹,到一个低维模型哈密顿包括耦合到耗散玻色子环境。后者编码由溶剂和分子构象动力学引起的波动效应。我们将这种方法应用于pG-pC和pA-pT DNA低聚物作为典型案例,并表明DNA构象波动对于确定和支持电荷传输至关重要。

英文摘要:

We present a hybrid method based on a combination of quantum/classical molecular dynamics (MD) simulations and a mod el Hamiltonian approach to describe charge transport through bio-molecular wires with variable lengths in presence o f a solvent. The core of our approach consists in a mapping of the bio-molecular electronic structure, as obtained f rom density-functional based tight-binding calculations of molecular structures along MD trajectories, onto a low di mensional model Hamiltonian including the coupling to a dissipative bosonic environment. The latter encodes fluctuat ion effects arising from the solvent and from the molecular conformational dynamics. We apply this approach to the c ase of pG-pC and pA-pT DNA oligomers as paradigmatic cases and show that the DNA conformational fluctuations are essential in determining and supporting charge transport.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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