Fanciulli, MauroMuff, StefanWeber, Andrew P.Dil, J. Hugo2017-07-102017-07-102017-07-10201710.1103/PhysRevB.95.245125https://infoscience.epfl.ch/handle/20.500.14299/138968WOS:000404019900005Photoelectrons produced from the excitation of spin-degenerate states in solids can have a sizable spin polarization, which is related to the phase of interfering channels in the photoemission matrix elements. Such spin polarization can be measured by spin-resolved photoemission spectroscopy to gain information about the transitions and the Wigner time delay of the process. Incorporating strongly correlated electron systems into this paradigm could yield a novel means of extracting phase information crucial to understanding the mechanism of their emergent behavior. In this work, we present, as a case study, experimental measurements of the cuprate superconductor Bi2Sr2CaCu2O8+delta by spin-resolved photoemission while maintaining full angular and energy resolution. A spin polarization of at least 10% is observed, which is related to the phase of the photoelectron wave function.Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+deltatext::journal::journal article::research article