Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: 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

DF 9.44: 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. Krasovskii^2,3,4, D. Marchenko⁵, E. V. Chulkov^2,4,6, 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.