DNA双螺旋结构中构象依赖的电子输运
Conformation dependent electronic transport in a DNA double-helix
摘要：
本文研究了紧束缚框架下DNA双螺旋构象依赖的电子输运性质，包括其螺旋对称性。我们已经研究了DNA的定位特性的变化，因为我们改变堆叠的碱基的数量内的间距的双螺旋保持DNA链中的核苷酸的总数固定。我们取三个DNA序列，其中两个是周期性的，一个是随机的，并且观察到定位长度随着我们增加DNA双螺旋的半径而增加，即，一个音高内的核苷酸数。我们还研究了主链能量对系统I-V响应的影响，发现在存在螺旋对称性的情况下，根据共形变化和无序强度的相互作用，可以在金属或半导体甚至绝缘相中发现DNA，这反过来又成功地解释了所有的实验结果。
英文摘要：
In this work we report the study of conformation dependent electronic transport properties of DNA double-helix within tight-binding framework including its helical symmetry. We have studied the changes in localization properties of DNA as we alter the number of stacked bases within a pitch of the double-helix keeping the total number of nucleotides in the DNA chain fixed. We take three DNA sequences, two of them are periodic and one is random and observe that localization length increases as we increase the radius of DNA double-helix i.e., number of nucleotides within a pitch. We have also investigated the effect of backbone energetic on the I-V response of the system and we find that in presence of helical symmetry, depending on the interplay of conformal variation and disorder strength DNA can be found in either metallic or semiconducting and even in an insulating phase, which in turn successfully explain all the experimental findings by a single model.
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