Quantum Critical Point at Finite Doping in the 2D Hubbard Model: A Dynamical Cluster Quantum Monte Carlo Study

被引：74

作者：

Vidhyadhiraja, N. S. ^{[1
]}

Macridin, A. ^{[2
]}

Sen, C. ^{[2
]}

Jarrell, M. ^{[2
]}

Ma, Michael ^{[2
]}

机构：

[1] Jawaharlal Nehru Ctr Adv Sci Res, Theoret Sci Unit, Bangalore 560064, Karnataka, India

[2] Univ Cincinnati, Cincinnati, OH 45221 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 20期

基金：

美国国家科学基金会;

关键词：

ELECTRON-SYSTEMS; PHASE; PSEUDOGAP; METALS;

D O I：

10.1103/PhysRevLett.102.206407

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We explore the Matsubara quasiparticle fraction and the pseudogap of the two-dimensional Hubbard model with the dynamical cluster quantum Monte Carlo method. The character of the quasiparticle fraction changes from non-Fermi-liquid, to marginal Fermi liquid, to Fermi liquid as a function of doping, indicating the presence of a quantum critical point separating non-Fermi-liquid from Fermi-liquid character. Marginal Fermi-liquid character is found at low temperatures at a very narrow range of doping where the single-particle density of states is also symmetric. At higher doping the character of the quasiparticle fraction is seen to cross over from Fermi liquid to marginal Fermi liquid as the temperature increases.

引用

页数：4

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