中国物理B ›› 2002, Vol. 11 ›› Issue (12): 1294-1299.doi: 10.1088/1009-1963/11/12/314

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Study of ac hopping conductivity on one-dimensional nanometre systems

徐慧, 宋祎璞   

  1. Department of Applied Physics, Central South University, Changsha 410083, China
  • 收稿日期:2002-06-03 修回日期:2002-08-10 出版日期:2005-06-12 发布日期:2005-06-12

Study of ac hopping conductivity on one-dimensional nanometre systems

Xu Hui (徐慧), Song Yi-Pu (宋祎璞)   

  1. Department of Applied Physics, Central South University, Changsha 410083, China
  • Received:2002-06-03 Revised:2002-08-10 Online:2005-06-12 Published:2005-06-12

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摘要： In this paper, we establish a one-dimensional random nanocrystalline chain model, we derive a new formula of ac electron－phonon－field conductance for electron tunnelling transfer in one-dimensional nanometre systems. By calculating the ac conductivity, the relationship between the electric field, temperature and conductivity is analysed, and the effect of crystalline grain size and distortion of interfacial atoms on the ac conductance is discussed. A characteristic of negative differential dependence of resistance and temperature in the low-temperature region for a nanometre system is found. The ac conductivity increases linearly with rising frequency of the electric field, and it tends to increase as the crystalline grain size increases and to decrease as the distorted degree of interfacial atoms increases.

Abstract: In this paper, we establish a one-dimensional random nanocrystalline chain model, we derive a new formula of ac electron－phonon－field conductance for electron tunnelling transfer in one-dimensional nanometre systems. By calculating the ac conductivity, the relationship between the electric field, temperature and conductivity is analysed, and the effect of crystalline grain size and distortion of interfacial atoms on the ac conductance is discussed. A characteristic of negative differential dependence of resistance and temperature in the low-temperature region for a nanometre system is found. The ac conductivity increases linearly with rising frequency of the electric field, and it tends to increase as the crystalline grain size increases and to decrease as the distorted degree of interfacial atoms increases.

Key words: ac hopping conductivity, nanometre crystalline grain, distortion of interfacial atoms

中图分类号:  (Mobility edges; hopping transport)

  • 72.20.Ee
63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)