Typical-Medium Theory of Mott-Anderson Localization
Typical-Medium Theory of Mott-Anderson Localization
复制标题
莫特-安德森定位的典型介质理论
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
V. Dobrosavljević
中科院分区：
文献类型：
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作者：
V. Dobrosavljević
Mott和安德森局域化路线一直被认为是驱动金属-绝缘体转变（MIT）的两个基本过程。很久以前就讨论过分别描述这些机制的理论，但是一种可以同时包括这两种机制的公认方法仍然难以捉摸。由于不容易找到一个合适的静态序参量，所以金属和绝缘体之间没有明显的静态对称性，这就提出了另一个基本问题。然而，最近的工作重新审视了安德森和莫特的原始论点，强调了金属和绝缘体之间的关键区别在于电子的动力学。这一物理图像表明，“典型的”从一个给定的晶格位置的（几何平均）逃逸率应被视为适当的动力学序参量的MIT，一个可以自然地描述安德森和莫特机制的本地化。本文综述了典型介质理论的最新研究成果，为Mott-Anderson相变的双流体性质提供了新的认识。
The Mott and the Anderson routes to localization have long been recognized as the two basic processes that can drive the metal-insulator transition (MIT). Theories separately describing each of these mechanisms were discussed long ago, but an accepted approach that can include both has remained elusive. The lack of any obvious static symmetry distinguishing the metal from the insulator poses another fundamental problem, since an appropriate static order parameter cannot be easily found. More recent work, however, has revisited the original arguments of Anderson and Mott, which stressed that the key diference between the metal end the insulator lies in the dynamics of the electron. This physical picture has suggested that the "typical" (geometrically averaged) escape rate from a given lattice site should be regarded as the proper dynamical order parameter for the MIT, one that can naturally describe both the Anderson and the Mott mechanism for localization. This article provides an overview of the recent results obtained from the corresponding Typical-Medium Theory, which provided new insight into the the two-fluid character of the Mott-Anderson transition.