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

2008/09/09 by N. S. Vidhyadhiraja, Alexandru Macridin, Vidhyadhiraja, N. S. +7 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum many-body systems #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.0809.1477

openalex publication_date 2008/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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.

Cited by

• Probing the pseudogap and beyond: examining single-particle properties of the hole- and electron-doped Hubbard model
• Probing quasiparticle excitations in a doped Mott insulator via Friedel oscillations

Related

• Non-Fermi Liquid Behaviour in the Three Dimensional Hubbard Model
• Destruction of Strong Critical Spin Fluctuations by Doping in the 2D Hubbard Model
• Properties of the Two-Dimensional Electron Gas Close to the Fermi-Liquid Quantum Critical Point
• Quasipartice Spectra in the Hubbard Model
• Interplay of single-particle and collective degrees of freedom near the quantum critical point