【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 .计算结果和实验符合很好更多还原

【Abstract】 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.更多还原