One-particle spectral functions of the one-dimensional Fermionic Hubbard model with one fermion per site at zero and finite magnetic fields

Here the line shape of up- and down-spin one-particle spectral functions at in (k,energy)-plane's vicinity their cusp singularities is studied for Mott-Hubbard insulator described by 1D Hubbard model with one fermion per site zero finite magnetic fields. At field they can be accessed terms electrons photoemission experiments. field, such corresponding interplay correlations magnetic-field effects refer to an involved non-perturbative many-particle problem that poorly understood. The gap separates addition removal calculated all spin densities interaction values. qualitative differences properties doped are also investigated. relation our theoretical results predictions both condensed-matter ultracold spin-1/2 atom systems discussed.