科研之友
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摘要
A electron-phonon-field conductance model of electron tunneling transfer is set up, and a new alternating current conductance formula in one-dimensional disordered system is derived. By calculating the alternating current conductivity, the relationship among the electric field, temperature and conductivity is analyzed, and the effect of disordered degree on the alternating current conductance is discussed. The result shows that the conductivity of the disordered system linearly increases with rising frequency of the electric field. In the low-temperature region, the disordered system shows the characteristic of negative differential dependence of resistance and temperature. On the contrary, its conductivity decreases with rising temperature in the high-temperature region. The disordered degree has obvious influence on the alternating current conductance. The alternating current conductivity is great when the disordered degree is weak in the low-temperature region. However, when the disordered degree is raised properly in the high-temperature region, it is advantageous to form the electron tunneling transfer and to increase the conductivity of the system. But when the disordered, degree is overly great, the alternating current conductivity becomes small.
- 出版日期2002-8
- 单位中南大学
