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一维二元非对角关联无序体系交流跳跃电导特性

马松山 徐 慧 李燕峰 张鹏华

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一维二元非对角关联无序体系交流跳跃电导特性

马松山, 徐 慧, 李燕峰, 张鹏华
cstr: 32037.14.aps.56.5394

Characteristic of alternating current hopping conductivity in one-dimensional binary disordered system with off-diagonal correlations

Ma Song-Shan, Xu Hui, Li Yan-Feng, Zhang Peng-Hua
cstr: 32037.14.aps.56.5394
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  • 在单电子紧束缚无序模型基础上,建立了一维二元非对角关联无序体系电子跳跃输运交流电导模型,并推导了其交流电导公式,通过计算其交流电导率,探讨了格点能量无序度、格点原子组分、非对角关联及温度、外场对体系交流跳跃电导的影响.计算结果表明,一维二元非对角关联无序体系的交流电导率随格点能量无序度的增大而减小.同时,体系中两种原子的组分的变化实际代表着体系成分无序程度的变化,因而对其交流电导率的影响很大,表现为随A类原子含量p的增加而先减小后增大.当引入非对角关联时,体系出现退局域化现象,电子波函数由局
    Based on a tight-binding disordered model describing a single electron band, we establish a model of one-dimensional binary disordered systems with off-diagonal correlations, and derive the alternating current (ac) conductance formula. By calculating the ac conductivity, the function of disorder and off-diagonal correlations in electronic transport are analyzed, and the dependence of the ac conductivity on the field frequency and the temperature is studied. The results indicate that the ac conductivity of one-dimensional binary disordered system decreases with the increasing of the degree of lattices energy disorder. And the ac conductivity of the system is also dependent on the probabilities p, which represents the degree of compositional disorder of the system to some extent. The ac conductivity of system first decreases with the increasing of p, then increases with farther increasing of p. We also find that off-diagonal correlations lead to delocalization and enhance the ac conductivity of the system,namely, the ac conductivity of one-dimensional binary disordered system with off-diagonal correlations is larger than that of uncorrelated system in the Anderson limit. Moreover, the ac conductivity of one-dimensional binary disordered system decreases with the increasing of temperature, and increases drastically with the increasing of the frequency of the electric field.
    • 基金项目: 高等学校博士学科点专项科研基金(批准号:20020533001),湖南省自然科学基金(批准号:05JJ40135)资助的课题.
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  • 文章访问数:  8713
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  • 被引次数: 0
出版历程
  • 收稿日期:  2006-11-13
  • 修回日期:  2007-11-13
  • 刊出日期:  2007-09-20

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