Two classes of Mott insulator
Two classes of Mott insulator
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两类莫特绝缘体
DOI：
10.1103/physrevb.67.024506
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发表时间：
2002
影响因子：
3.7
通讯作者：
S. Kivelson
中科院分区：
文献类型：
--
作者：
Dung;S. Kivelson
自然界中有两类莫特绝缘体，它们对弱掺杂的反应不同。随着化学势的增加，I型莫特绝缘体经历从未掺杂相到掺杂相的一阶相变。在长程库仑相互作用的存在下，这导致了表现出“微相分离”的非均匀状态。“相反，在II型莫特绝缘体中，电荷持续超过临界化学势。我们表明，如果绝缘状态有一个破缺的对称性，这将增加的可能性，它将是I型。这两种莫特绝缘体与我们熟悉的I型和II型超导体之间存在着密切的相似之处。
There are two classes of Mott insulators in nature, distinguished by their responses to weak doping. With increasing chemical potential, type I Mott insulators undergo a first order phase transition from the undoped to the doped phase. In the presence of long-range Coulomb interactions, this leads to an inhomogeneous state exhibiting "micro-phase separation." In contrast, in type II Mott insulators charges go in continuously above a critical chemical potential. We show that if the insulating state has a broken symmetry, this increases the likelihood that it will be type I. There exists a close analogy between these two types of Mott insulators and the familiar type I and type II superconductors.