Speaker
Description
We study the half-filled two-dimensional Hubbard model on a square lattice in cellular dynamical mean-field theory (CDMFT), a real-space cluster extension [1] of the dynamical mean-field theory. By increasing the number of cluster sites up to 6x6 we observe a progressive reduction of the onset interaction U of a metal-insulator crossover. In particular, in the case of 4x4 sites, we observe a site- dependent U, which is lower at the center sites than at the corner sites. In addition to this real-space analysis we investigate different periodization schemes for the one-particle spectral function in the half-filled and doped case.
[1] M. Klett, N. Wentzell, T.Schäfer, F. ŠimkovicIV, O. Parcollet, S. Andergassen, and P. Hansmann, Phys. Rev. Research 2, 033476 (2020).
