Spectral functions in itinerant electron systems with geometrical frustration

2002/04/03 by Yoshiki Imai, Norio Kawakami · 3 citations
Physics and Astronomy · #Antiferromagnetism #Cluster (spacecraft) #Condensed matter physics #Electron #Frustration #Geometrical frustration #Hexagonal lattice #Hubbard model #Lattice (music) #Magnetic properties of thin films #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Rare-earth and actinide compounds #Strongly correlated material #Superconductivity #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.65.233103

4 pages, 5 eps figures

arxiv created 2002/04/03 · openalex publication_date 2002/05/28 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The Hubbard model with geometrical frustration is investigated in a metallic phase close to half-filling. We calculate the single particle spectral function for the triangular lattice within dynamical cluster approximation, which is further combined with noncrossing approximation and fluctuation exchange approximation to treat the resulting cluster Anderson model. It is shown that frustration due to nonlocal correlations suppresses short-range antiferromagnetic fluctuations and thereby assists the formation of heavy quasiparticles near half-filling.

Citations

• Quantum Monte Carlo algorithm for nonlocal corrections to the dynamical mean-field approximation
• Review of techniques in the large-Nexpansion for dilute magnetic alloys
• Mott metal-insulator transition in the half-filled Hubbard model on the triangular lattice

Cited by

• Quantum cluster theories
• Multisite versus multiorbital Coulomb correlations studied within finite-temperature exact diagonalization dynamical mean-field theory
• Mott transition in two-band fermion model with on-site Coulomb repulsion