English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the ultra-fast optical response of quasi-particles (QPs) in boththe pseudogap (PG) and superconducting (SC) states of underdoped (UD)Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212) single crystal measured withthe time-resolved pump-probe technique. At a probe energy$\hbar\omega_{pr}$=1.55 eV, it is found that the reflectivity change$\Delta$R/R changes its sign at exactly $T_{c}$, which allows the directseparation of the charge dynamics of PG and SC QPs. Further systematicinvestigations indicate that the transient signals associated with PG and SCQPs depend on the probe beam energy and polarization. By tuning them below$T_{c}$ two distinct components can be detected simultaneously, providingevidence for the coexistence of PG and SC QPs.

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