Magnetic and dynamic properties of the Hubbard model in infinite dimensions
Magnetic and dynamic properties of the Hubbard model in infinite dimensions
复制标题
无限维哈伯德模型的磁和动力学特性
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
T. Pruschke
中科院分区：
文献类型：
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作者：
M. Jarrell;T. Pruschke
无限维Hubbard模型的一个基本上精确的解决方案是可能的，通过使用一个自洽映射的Hubbard模型在这个限制的一个有效的单杂质安德森模型。解决后者与量子蒙特卡罗程序使我们能够获得精确的结果的一个和两个粒子的性质的无限维哈伯德模型。特别是，我们发现反铁磁性和赝间隙的状态的单粒子密度足够大的值的intrasite库仑相互作用在半填充。反铁磁相和绝缘相以上的内尔温度被发现被迅速抑制掺杂。后者被取代的重电子金属与准粒子的质量强烈依赖于掺杂，只要asn<1。在半填充的反铁磁相界同意令人惊讶的形状和数量级与三维哈伯德模型的结果。
An essentially exact solution of the infinite dimensional Hubbard model is made possible by using a self-consistent mapping of the Hubbard model in this limit to an effective single impurity Anderson model. Solving the latter with quantum Monte Carlo procedures enables us to obtain exact results for the one and two-particle properties of the infinite dimensional Hubbard model. In particular, we find antiferromagnetism and a pseudogap in the single-particle density of states for sufficiently large values of the intrasite Coulomb interaction at half filling. Both the antiferromagnetic phase and the insulating phase above the Néel temperature are found to be quickly suppressed on doping. The latter is replaced by a heavy electron metal with a quasiparticle mass strongly dependent on doping as soon asn<1. At half filling the antiferromagnetic phase boundary agrees surprisingly well in shape and order of magnitude with results for the three dimensional Hubbard model.