Temperature dependence of Fermi Arc in underdoped cuprates and restoration of the symmetry breaking

The mechanism for the evolution of the Fermi arc with increasing the temperature in high-Tc cuprates has been proposed. We have discussed the electrical resistivity in the normal state and the linear-like decreasing of the spin part of the Knight shift from the large pseudogap, whose corresponding temperature is TmK, to the small pseudogap, whose corresponding temperature is T*.