Direct observation of the coexistence of pseudogap and superconducting quasi-particles in Bi2212 by time-resolved optical spectroscopy

Y. H. Liu, Y. Toda, K. Shimatake +3

We report the ultra-fast optical response of quasi-particles (QPs) in both the pseudogap (PG) and superconducting (SC) states of underdoped (UD) Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$…