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arXiv 0910.0348cond-mat.softcond-mat.mtrl-sci
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DNA分子线的结构涨落和量子输运:结合分子动力学和模型哈密顿方法

Structural fluctuations and quantum transport through DNA molecular wires: a combined molecular dynamics and model Hamiltonian approach

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

摘要:

采用量子力学电子结构计算和经典分子动力学模拟结合的混合计算方法,研究了结构涨落下短链DNA低聚体(Dickerson十二聚体)的电荷输运.基于片段轨道描述,DNA电子结构可以以非常有效的方式粗粒度化。无论是从溶剂的波动或从碱基对振动模式所产生的动态波动的影响,可以考虑在一个简单的方式通过时间序列的有效DNA电子参数,沿MD轨迹的快照进行评估。我们表明,电荷传输可以促进通过耦合到溶剂的波动,门的现场能量沿DNA线。

英文摘要:

Charge transport through a short DNA oligomer (Dickerson dodecamer) in presence of structural fluctuations is investigated using a hybrid computational methodology based on a combination of quantum mechanical electronic structure calculations and classical molecular dynamics simulations with a model Hamiltonian approach. Based on a fragment orbital description, the DNA electronic structure can be coarse-grained in a very efficient way. The influence of dynamical fluctuations arising either from the solvent fluctuations or from base-pair vibrational modes can be taken into account in a straightforward way through time series of the effective DNA electronic parameters, evaluated at snapshots along the MD trajectory. We show that charge transport can be promoted through the coupling to solvent fluctuations, which gate the onsite energies along the DNA wire.

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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