DNA双螺旋结构中的局域化现象:扭曲梯形模型
Localization phenomena in a DNA double helix structure : A twisted ladder model
摘要:
在这项工作中,我们提出了一个模型的DNA双螺旋紧结合框架内,纳入螺旋的分子。我们研究了三种DNA序列的局域化性质,它们是周期性的poly(dG)-poly(dC)和poly(dA)-poly(dT)序列以及随机的ATGC序列,它们都耦合到具有代表环境涨落的随机位点能量的主链上。我们观察到,由于DNA的螺旋性,电子输运大大增强,并且几乎存在一个与无序强度无关的跳跃积分临界值,该临界值解释了DNA的螺旋性,使电子态得到最大扩展。我们还研究了主链能量学对DNA传输和I-V特性的影响。
英文摘要:
In this work we propose a model for DNA double helix within the tight-binding framework that incorporates the helicity of the molecules. We have studied localization properties of three DNAsequences,the periodic poly(dG)-poly(dC) and poly(dA)-poly(dT) sequences and the random ATGCsequence, all of which are coupled to backbone withrandom site energies representing the environmentalfluctuations. We observe that due to helicity of DNA, electron transport is greatly enhancedand there exists almost a disorder-strength independent critical value of the hopping integral, thataccounts for helicity of DNA, for which the electronic states become maximally extended. We havealso investigated the effect of backbone energetics on the transmission and I-V characteristics of DNA.
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