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After photon absorption, electrons from a dispersive band of a solid requirea finite time in the photoemission process before being photoemitted as freeparticles, in line with recent attosecondresolved photoemission experiments.According to the Eisenbud-Wigner-Smith model, the time delay is due to a phaseshift of different transitions that occur in the process. Such a phase shift isalso at the origin of the angular dependent spin polarization of thephotoelectron beam, observable in spin degenerate systems without angularmomentum transfer by the incident photon. We propose a semi-quantitative modelwhich permits to relate spin and time scales in photoemission from condensedmatter targets and to better understand spin- and angle-resolved photoemissionspectroscopy (SARPES) experiments on spin degenerate systems. We also presentthe first experimental determination by SARPES of this time delay in adispersive band, which is found to be greater than 26 as for electrons emittedfrom the sp-bulk band of the model system Cu(111).

Spin polarization and attosecond time delay in photoemission from spin degenerate states of solids