The Eisenbud-Wigner-Smith (EWS) time delay of photoemission depends
on the phase term of the matrix element describing the transition.
Because of an interference process between partial channels, the
photoelectrons acquire a spin polarization which is also related to the
phase term. The analytical model for estimating the time delay by
measuring the spin polarization is reviewed in this manuscript. In
particular, the distinction between scattering EWS and interfering EWS
time delay will be introduced, providing an insight in the chronoscopy
of photoemission. The method is applied to the recent experimental data
for Cu(111) presented in M. Fanciulli et al., PRL 118, 067402
(2017), allowing to give better upper and lower bounds and
estimates for the EWS time delays.
Determination of Fermi contour and spin polarization ofν=32composite fermions via ballistic commensurability measurements
