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

Abstract

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${}_{8+\delta }$ (Bi2212) single crystal measured with the time-resolved pump-probe technique. At a probe energy $\hslash {\omega }_{pr}$=1.55 eV, it is found that the reflectivity change $\Delta$R/R changes its sign at exactly $T_c$, which allows the direct separation of the charge dynamics of PG and SC QPs. Further systematic investigations indicate that the transient signals associated with PG and SC QPs depend on the probe beam energy and polarization. By tuning them below $T_c$ two distinct components can be detected simultaneously, providing evidence for the coexistence of PG and SC QPs.

4 figures. One report on the ultrast dynamics of quasiparticles in underdoped Bi2Sr2CaCu2O8

References in corpus (3)

• Distinct Fermi-Momentum Dependent Energy Gaps in Deeply Underdoped Bi2212
• Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates
• Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system

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