The original published version of this article may be found on the Physical Review B website:http://dx.doi.org/10.1103/PhysRevB.77.033418Copyright (2008) American Physical Society
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机译:本文的原始发行版本可以在Physical Review B网站上找到:http://dx.doi.org/10.1103/PhysRevB.77.033418版权所有(2008)American Physical Society
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