Taniguchi Masateru, Kawai Tomoji
Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Dec;72(6 Pt 1):061909. doi: 10.1103/PhysRevE.72.061909. Epub 2005 Dec 14.
Within a tight-binding electron-phonon interacting model, we calculated the spectrally resolved polaron binding energy between electrons and phonons and between holes and phonons on poly(dA).poly(dT) and poly(dG).poly(dC).Poly(dA).Poly(dT) is a DNA where one single strand consists only of adenine(A) and the other single strand consists only of thymine(T), while Poly(dG).Poly(dC) is a DNA where one single strand consist only of guanine(G) and the other of cytosine(C). We found that the polaron binding energies of poly(dA).poly(dT) were larger than those of poly(dG).poly(dC), and that the polaron binding energy and the electrical conductance were strongly temperature dependent. These findings agree well with the current experimental data. We concluded that small polaron hopping occurs by a conduction mechanism on the DNA molecules examined.
在一个紧束缚电子 - 声子相互作用模型中，我们计算了聚（dA）·聚（dT）和聚（dG）·聚（dC）上电子与声子之间以及空穴与声子之间的光谱分辨极化子结合能。聚（dA）·聚（dT）是一种DNA，其中一条单链仅由腺嘌呤（A）组成，另一条单链仅由胸腺嘧啶（T）组成，而聚（dG）·聚（dC）是一种DNA，其中一条单链仅由鸟嘌呤（G）组成，另一条由胞嘧啶（C）组成。我们发现聚（dA）·聚（dT）的极化子结合能大于聚（dG）·聚（dC）的极化子结合能，并且极化子结合能和电导率强烈依赖于温度。这些发现与当前的实验数据非常吻合。我们得出结论，在所研究的DNA分子上，小极化子跳跃是通过一种传导机制发生的。
