2021/04/20 by Philip Bleicker, Dag-Björn Hering, Götz S. Uhrig
Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Degrees of freedom (physics and chemistry) #Excitation #Fermi Gamma-ray Space Telescope #Gaussian #Hubbard model #Limit (mathematics) #Mott insulator #Multi band #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevb.105.085121
published as Phys. Rev. B 105, 085121 (2022)
arxiv created 2021/04/20 · openalex publication_date 2022/02/14 · arxiv updated 2022/02/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
With the aid of both a semianalytical and a numerically exact method, we investigate the charge dynamics in the vicinity of half-filling in the one- and two-dimensional t\text\ensuremath-J model derived from a Fermi-Hubbard model in the limit of large interaction U and hence small exchange coupling J. The spin degrees of freedom are taken to be disordered. So we consider the limit 0<J\ensuremath≪T\ensuremath≪W, where W is the bandwidth. We focus on evaluating the local spectral density of a single hole excitation and the charge gap that separates the upper and the lower Hubbard band. We find indications that no band edges exist if the magnetic exchange is taken into account; instead of band edges, Gaussian tails seem to appear. A discussion of the underlying physics is provided.