Polarized Electrons in Surface Physics

Spin-resolved off-normal photoemission from xenon adsorbates in comparison with free-atom photoionization

“…This component, which is independent of the helicity of the radiation, is forbidden in the photoexcitation of an infinite three dimensional centro-symmetric solid [14,16]. Figure 4 shows the comparison of Pz(O = 30 °) as function of the light energy between gas phase and adsorbate.…”

“…Similar normal-emission experiments at non-ferromagnetic single crystal surfaces [8][9][10][11][12][13] allowed to characterize the symmetry of the bands involved and to perform a symmetry-resolved band mapping. The spin effects discussed here are based on the spin-orbit interaction and partly depend on the relativistic selection rules for dipole transitions with circularly polarized radiation [14][15][16]. In contrast to this, spin effects in photoemission from ferromagnetic solids [17] are primarily an effect of the initial states spin split due to the exchange interaction.…”

“…* This article is dedicated to Professor Dr. J. Kessler, M/inster on the occasion of his 60th birthday Spin-resolved off-normal photoemission from solids (described in a three step model) contains the problem to distinguish between spin dependent effects in the photoelectron excitation, in the transport to the surface, and in the transmission at the surface [14][15][16]. This has been experimentally studied for off-normal photoemission from Pt(lll) [18][19][20].…”

“…Furthermore, the photoelectron emission was studied in the mirror plane of adsorbate and substrate. For this condition electron scattering only yields a spin-polarization component normal to the scattering plane, comparable to a single scattering process [14][15][16]22]. Additionally we used Xe as adsorbate system because for a Xe single crystal the experimental LEED results can be well fitted within a single scattering (kinematic) approximation [23].…”

Determination of surface and interface magnetic properties for the multiferroic heterostructure Co/BaTiO3using spleed and arpes

“…As described in our previous work we use the layer-KKR approach to the calculate the corresponding SPLEED pattern [10,11]. Within the scope of this method a semi-infinite surface system is treated as a stack of atomic layers using the so-called layer doubling method [12].…”