Absolute spin calibration of an electron spin polarimeter by spin-resolved photoemission from the Au(111) surface states

Abstract

Here we report the absolute characterization of a spin polarimeter by measuring the Sherman function with high precision. These results have been obtained from the analysis of the spin and angle-resolved photoemission spectra of Au(111) surface states. The measurements have been performed with a 250 kHz repetition rate Ti:sapphire amplified laser system combined with a high energy-, angle-, and spin-resolving time-of-flight electron spectrometer.

Rashba effect in antimony and bismuth studied by spin-resolved ARPES

“…We set the energy resolution during the regular and spin-resolved ARPES measurements at 8 and 40 meV, respectively. To obtain the spin-resolved ARPES spectrum, we used the Sherman function value of 0.07 as estimated by the Rashba-split surface state of Au(111) single crystal [34]. We set the sample geometry to predominantly observe the ΓM direction of the surface Brillouin zone (see figure 1(d)) where the bulk Γ and T points are projected onto the Γ point, while the bulk X and L points are projected onto theM point.…”

Fet2gband dispersion and spin polarization in thin films of Fe3O4Wang1, Mariot2, Richter3 et al. 2013Phys. Rev. B426330View full textAdd to dashboardCite

“…The SRPES measurements were done using a time-of-flight electron analyzer collecting the electrons at normal emission, equipped with a Mott polarimeter. 27 Barium borate crystals were used for phase-matched harmonic generation of 4.65 and 6.20 eV photons from the 250 kHz Ti:sapphire laser source of the T-ReX laboratory (FERMI@Elettra, Trieste). In this case, the measurements necessitated sample transfer in air.…”

Momentum-Resolved Spin Dynamics of Bulk and Surface Excited States in the Topological InsulatorBi2Se3

“…In the proximity of E F the decay times are comparable [21]. By taking advantage of the large signalto-noise ratio of our time-of-flight detector [34], we observe that in the energy region 300-500 meV above E F the minority spin components persist for longer times. This behavior suggests that the out-of-equilibrium electronic properties cannot be described in terms of a single thermalized electronic population.…”