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arXiv 1210.7201cond-mat.str-el
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Mott跃迁附近的有限温度渡越和量子Widom线

Finite temperature crossovers and the quantum Widom line near the Mott transition

J. Vucicevic, H. Terletska, D. Tanaskovic, V. Dobrosavljevic

摘要:

实验建立的半满哈伯德模型相图的特点存在三个不同的有限温度制度,分开的扩展交叉区域。一些交叉线可以被定义为跨越这些地区,我们探讨定量的详细框架内的动态平均场论。最重要的是,坏金属和莫特绝缘体制度之间的高温交叉显示了许多现象,标志着莫特绝缘状态的逐渐发展。我们讨论了在这种制度中发现的量子临界标度行为,并提出了方法,以促进其可能的实验观察。我们还介绍了{ \em量子Widom线}的概念,并提出了一个详细的讨论,突出其物理意义时,在量子相变的背景下使用。

英文摘要:

The experimentally established phase diagram of the half-filled Hubbard model features the existence of three distinct finite-temperature regimes, separated by extended crossover regions. A number of crossover lines can be defined to span those regions, which we explore in quantitative detail within the framework of dynamical mean-field theory. Most significantly, the high temperature crossover between the bad metal and Mott-insulator regimes displays a number of phenomena marking the gradual development of the Mott insulating state. We discuss the quantum critical scaling behavior found in this regime, and propose methods to facilitate its possible experimental observation. We also introduce the concept of {\em quantum Widom lines} and present a detailed discussion that highlights its physical meaning when used in the context of quantum phase transitions.

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