准周期Fibonacci不等能格点链的hopping电导

考虑格点能的客观差异,从Miller- Abrahams 理论推导出一个实际应用方程.利用实空间重正化群方法研究了Fibonacci 准晶链的温度相关电导.结果发现不等能格点链的hopping 电导与等能格点链的基本相似,但格点能的差值不同可能使电导率虚部的低频峰变成一个谷;而且计算表明高低频电导率有两种不同的温度依赖性,并且跃迁率、格点能、格点距离及费米能对温度相关电导有不同的影响

The Hopping Conductivity of the Fibonacci Quasilattice Dence of the Correlation Fluctua

Considered site-energy differences , we deduce a practical equation from the Miller-Abrahams' theory and the temperature-dependent conductivity of Fibonacci lattice is investigated by a real-space renormalization-group approach. It is found that the hopping conductivity property of the chain with different site-energy is similar to that of the iso-energy site chain, however, the site-energy differences can cause the transformations between peak and valley of the imaginary conductivity at low frequency. Furthermore, our results show that there exist two types of temperature-dependent conductivity at low-and high-frequency, and transition rate, site-energy, Fermi-energy and distance between sites have different influences on the temperature-dependent conductivity.