2003/04/08 by Claudio Attaccalite, Michele Fabrizio
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum many-body systems #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.68.155117
29 pages
arxiv created 2003/04/08 · openalex publication_date 2003/10/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
We analyze the Mott transition in multiband Hubbard models with the inclusion of multiplet exchange splittings as it arises in infinite dimensions by using the generalized Gutzwiller wave function introduced by B"unemann, Weber, and Gebhard [Phys. Rev. B 57, 6896 (1998)]. We also present an extension of that variational wave function to account for broken-symmetry solutions, which still allows an exact analytical treatment. Our analysis reveals some drawbacks of the variational wave function, which, in our opinion, imply that Gutzwiller-type wave functions do not properly characterize quasiparticles close to a Mott transition even in the limit of infinite dimensions.