Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Electronic Structure of Surfaces: Spectroscopy, Surface States I

O 79.8: Vortrag

Mittwoch, 22. März 2017, 17:00–17:15, WIL C307

Investigation of the Mahan cones spin polarization of noble metal surfaces — •Benito Arnoldi, Johannes Stöckl, Mirko Cinchetti, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics, TU Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

The angle resolved photoemission (ARPES) yield of noble metals such as Au, Ag or Cu recorded at low photon energies is dominated by direct optical transitions between free electron like sp-bands of the bulk band structure, the so called Mahan cones [1]. During the optical transition, the momentum conservation leads to an exchange of momentum between the photoelectron and the crystal lattice by adsorption of a reciprocal lattice vector.
Here, we employ spin and angle resolved laser ARPES with linear polarized light to gain insight into the spin polarization of these direct optical transitions for different noble metal surfaces. For hν ≈ 6 eV and hν ≈ 3 eV in the 1 photon photoemission emission (1PPE) and 2 photon photoemission (2PPE) process for the Au(111) surface, we observe clear spin-polarization of the Mahan cones along all high symmetry directions. Similar results will be presented for the Au(110) as well as for Cu(111) surface. A comparison of our results will allow us to reveal the influence of the spin-orbit coupling on the spin-polarization of the Mahan cones of noble metal surfaces. [1]New J. Phys. 14 (2012) 083027