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In a conventional framework, superconductivity is lost at a criticaltemperature (T_c) because, at higher temperatures, gluing bosons can no longerbind two electrons into a Cooper pair. In high-T_c cuprates, it is stillunknown how superconductivity vanishes at T_c. We provide evidence that theso-called <~70-meV kink bosons that dress the quasi-particle excitations areplaying a key role in the loss of superconductivity in a cuprate. We irradiateda 170-fs laser pulse on Bi2Sr2CaCu2O8+\delta and monitored the responses of thesuperconducting gap and dressed quasi-particles by time- and angle-resolvedphotoemission spectroscopy. We observe an ultrafast loss of superconducting gapnear the d-wave node, or light-induced Fermi arcs, which is accompanied byspectral broadenings and weight redistributions occurring within the kinkbinding energy. We discuss that the underlying mechanism of the spectralbroadening that induce the Fermi arc is the undressing of quasi-particles fromthe kink bosons. The loss mechanism is beyond the conventional framework, andcan accept the unconventional phenomena such as the signatures of Cooper pairsremaining at temperatures above T_c.

Quasi-particles ultrafastly releasing kink bosons to form Fermi arcs in a cuprate superconductor