Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
MA 20.44: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Topology of spin polarization of the 5d states on W(110) and Al/W(110) surfaces — •Artem G. Rybkin1, E. E. Krasovskii2,3,4, D. Marchenko5, E. V. Chulkov2,4,6, A. Varykhalov5, O. Rader5, and A. M. Shikin1 — 1St. Petersburg State University — 2University of the Basque Country, San Sebastián — 3IKERBASQUE Bilbao — 4Donostia International Physics Center — 5Helmholtz-Zentrum Berlin — 6Materials Physics Center, CSIC-UPV/EHU, San Sebastián
The spin polarization of W(110) and Al/W(110) surfaces is studied by spin- and angle-resolved photoemission. On both surfaces distinct E(k∥) dispersions are identified with an unusual topology: a single spectral branch is spin polarized antisymmetrically relative to the Γ point, and two spin-polarized branches cross at Γ. Based on ab initio theory coupled with one-step photoemission calculations, we show that the measured spin polarization is a property of the ground state and identify the effect as the counterpart of the recently discovered Rashba-polarized bulk states but with a distinct non-Rashba topology. We address also the question of topological protection.