2008/02/21 by Y. H. Liu, Y. Toda, Yasunori Toda +4 · 80 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Energy (signal processing) #Laser #Magnetic and transport properties of perovskites and related materials #Optics #Physical chemistry #Physics #Physics of Superconductivity and Magnetism #Polarization (electrochemistry) #Pseudogap #Quantum mechanics #Quasiparticle #Superconductivity #Ultrashort pulse #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.101.137003
published in Physical Review Letters 101(13), 137003 (American Physical Society) · 4 figures. One report on the ultrast dynamics of quasiparticles in underdoped Bi2Sr2CaCu2O8
arxiv created 2008/02/21 · openalex publication_date 2008/09/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the ultrafast optical response of quasiparticles (QPs) in both the pseudogap (PG) and superconducting (SC) states of an underdoped Bi2Sr2CaCu2O8 + y (Bi2212) single crystal measured with the time-resolved pump-probe technique. At a probe energy variant planck's over omegapr = 1.55 eV, it is found that the reflectivity change DeltaR/R changes its sign at exactly Tc, 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 Tc, two distinct components can be detected simultaneously, providing evidence for the coexistence of PG and SC QPs.