摘要
建立了电子隧穿电导模型 ,推导了一维无序体系新的直流电导公式 .通过计算 2 0 0 0 0格点无序体系的直流电导率 ,分析了直流电导率和温度及外场电压的关系 ,讨论了无序度对直流电导的影响 .计算结果表明 ,无序体系的直流电导率随无序度的增加而减小 ;外加电场较小时 ,电导率相对较大 ,且出现一系列峰值 ,电压较大时 ,电导率反而较小 ;无序体系在低温区出现了负微分电阻特性 ,电导率随温度的升高而增大 ,在高温区电导率随温度的升高而减小 .
A conductance model of electronic tunneling transfer is set up, and a new D. C conductance formula in one-dimensional disordered system is derived. By calculating the D. C conductivity, the relationship among the electric field, temperature and conductivity is analyzed, and the effect of disordered degree on the D. C conductance is discussed. The result shows that the conductivity of a disordered system decreases with the increase of disordered degree. When the electric field is weak, its conductivity is high and has a series of peak values. Hewever, when the electric field is strong, its conductivity is weak. In the low-temperature region, the disordered system shows a characteristic of negative differential dependence of resistance and temperature. On the contrary, its conductivity decreases with the rise of temperature in the high-temperature region. This result is in good agreement with the experiments.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第1期143-147,共5页
Acta Physica Sinica
