Local Electron Correlations in a Two-dimensional Hubbard Model on the   Penrose Lattice
  We study electron correlations in the half-filled Hubbard model on two-dimensional Penrose lattice. Applying the real-space dynamical mean-field theory to large clusters, we discuss how low-temperature properties are affected by the quasiperiodic structure. By calculating the double occupancy and renormalization factor at each site, we clarify the existence of the Mott transition. The spatially-dependent renormalization characteristic of geometrical structure is also addressed. 
Nayuta Takemori and Akihisa Koga
cond-mat.str-el