Homomorphic Cluster Coherent Potential Approximation for Systems with Site-Diagonal and/or Off-Diagonal Randomness
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概要
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We apply the homomorphic cluster coherent potential approximation (IICPA)to systems with site-diagonal and/or off-diagonal randomness. We show numeri-cally that the average Green's function obtained on the basis of the HCPA isanalytic off the real axis on the complex energy plane. We also show that theHCPA reproduces the ordinary single-site CPA and the molecular CPA whensystems include only diagonal disorder. The HCPA is advantageous in thatit can deal with both site-diagonal and off-diagonal disorder in a unified manner.We also present a numerical result for a disordered chain by taking both kindsof disorder into account. The density of states calculated in the HCPA is in goodagreement with the result of a computer simulation.
- 1979-08-15
著者
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Odagaki Takashi
Department Of Chemistry Faculty Of Science Kyoto University
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Yonezawa Fumiko
Research Institute For Fundamental For Fundamental Physics Kyoto Uversity
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