Signatures of superconductivity and pseudogap formation in nonequilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission

Article

关键词: DOPING DEPENDENCE;    PAIR FORMATION;    BI2SR2CACU2O8+DELTA;    TEMPERATURE;    COMPETITION;    BEHAVIOR;    SPECTRA;    BI;   

DOI  :  10.1103/PhysRevB.88.245132

来源: SCIE

【 摘 要 】

We use time- and angle-resolved photoemission to measure the nodal nonequilibrium electronic states in various dopings of Bi2Sr2CaCu2O8+delta. We find that the initial pump-induced transient signal of these ungapped states is strongly affected by the onset of the superconducting gap at T-c, superconducting pairing fluctuations at T-p, and the pseudogap at T*. Moreover, T-p marks a suggestive threshold in the fluence-dependent transient signal, with the appearance of a critical fluence below T-p that corresponds to the energy required to break apart all Cooper pairs. These results challenge the notion of a nodal-antinodal dichotomy in cuprate superconductors by establishing a link between nodal quasiparticles and the cuprate phase diagram.

【 授权许可】

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