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arXiv 0709.0954cond-mat.soft
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DNA分子中的极化子隧穿动力学

Polaron tunneling dynamics in the DNA molecule

Dr Julia A. Berashevich, Vadim Apalkov, Tapash Chakraborty

摘要:

在半经典Peyrard-Biship-Holstein极化子模型下研究了DNA链中极化子的形成和迁移。通过比较量子化学和半经典计算得到的极化子系统的能量,我们得到了聚DNA序列的荷-声耦合常数。发现G-C对的耦合常数比A-T对的大。利用这个耦合常数,我们研究了DNA分子中的隧穿。隧穿的速率和性质对DNA序列有很强的依赖性。通过改变分子桥中的陷阱位置,隧穿速率可以变化高达七个数量级。

英文摘要:

The formation of polaron and its migration in a DNA chain are studied within a semiclassical Peyrard-Biship-Holstein polaron model. Comparing the energetics of the polaron system found from the quantum chemical and semiclassical calculations, we extract the charge-phonon coupling constant for poly DNA sequences. The coupling constant is found to be larger for the G-C than for the A-T pairs. With this coupling constant we study tunneling in the DNA molecule. The rates and the nature of tunneling have strong dependence on the DNA sequence. By changing the trap positions in the molecular bridge the tunneling rate can by varied up to seven orders of magnitude.

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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