Delocalization in disordered chains with random symmetrical impurities |
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Authors: | XQ Huang RW Peng F Qiu SS Jiang A Hu |
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Institution: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, PR China, CN;(2) Communication Researching Section, Communication Engineering Institute of Nanjing, PLA University of Science aaand Technology, Nanjing 210016, PR China, CN |
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Abstract: | We study in this paper, with the context of a tight-binding on-side model, the electronic properties of one-dimensional random
lattices with correlated impurities. We show that, when symmetrical impurities
are inserted in a host chain of site energy and a constant hopping interaction V, diffusion will occur even when is random. We provide analytic expressions for the transmittance and confirm the theoretical results by a great deal of numerical
calculations. When = V, we find that the mean-square displacement (MSD) follows the law
m
2
∝t
β with β = 2.0 for = constant and β = 1.0 for = = random, respectively.
Received 15 January 2001 and Received in final form 30 April 2001 |
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Keywords: | PACS 71 55 Jv Disordered structure amorphous and glassy solids – 72 15 Rn Localization effects (Anderson or weak localization) – 71 23 -k Electronic structure of disordered solids |
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