Spin and charge fluctuations in the Hubbard model
arXiv:1606.04396 · doi:10.1016/j.jmmm.2016.12.045
Abstract
Using the strong coupling diagram technique for calculating the electron Green's function of the two-dimensional Hubbard model we have summed infinite sequences of ladder diagrams, which describe interactions of electrons with spin and charge fluctuations. For sufficiently low temperatures and doping a pronounced four-band structure is observed in spectral functions. Its appearance is related to the proximity of the transition to the long-range antiferromagnetic order.
4 pages, 4 figures, EASTMAG-2016