2007/10/12 by Pouyan Ghaemi, T. Senthil, P. Coleman +1 · 23 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Condensed matter physics #Cuprate #Fermi Gamma-ray Space Telescope #Fermi liquid theory #Fermi surface #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Quasiparticle #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.245108
published in Physical Review B 77(24) (American Physical Society) · 10 pages, 1 figure
arxiv created 2007/10/12 · openalex publication_date 2008/06/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The variation in the quasiparticle weight Z on moving around the Fermi surface in correlated metals is studied theoretically. Our primary example is a heavy Fermi liquid treated within the standard hybridization mean-field theory. The most dramatic variation in the quasiparticle weight happens in situations where the hybridization vanishes along certain directions in momentum space. Such a ``hybridization node'' is demonstrated for a simplified model of a cerium-based cubic heavy electron metal. We show that the quasiparticle weight varies from almost unity in some directions to values approaching zero in others. This is accompanied by a similar variation in the quasiparticle effective mass. Some consequences of such hybridization nodes and the associated angle dependence are explored. Comparisons with somewhat similar phenomena in the normal metallic state of cuprate materials are discussed. A phenomenological picture of the pseudogap state in cuprates with a large Fermi surface with a severely anisotropic spectral weight is explored.