Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 40: Topological Insulators (jointly with HL, MA)

TT 40.9: Vortrag

Mittwoch, 16. März 2011, 18:45–19:00, HSZ 04

Rashba-type surface emission observed on W(110) — •Juergen Braun¹, Jan Minar¹, Akio Kimura², Koji Miyamoto², Markus Donath³, and Hubert Ebert¹ — ¹Department Chemie, LMU München, Germany — ²Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Japan — ³Physikalisches Institut, Universität Münster, Germany

In this contribution we discuss surface related spectral features of bcc W(110) by means of angle- and spin-resolved photoemission. For more than thirty years Tungsten serves as a prototypical material for studying spin-orbit effects in simple metals. Also, it is used for a quite long time in electron polarimeters [1]. Nevertheless, there still remain some pecularities in its electronic structure concerning surface emission. It is known that a surface resonance exists on W(110) dispersing around Γ in the vicinity of the Fermi level [2]. But not much is understood concerning surface emission for higher binding energies. From our investigation we found that surface emission dominates the E(k_∥) intensity distribution measured along Γ N. The spin analysis reveals a Rashba-like behavior for features related to the spin-orbit induced symmetry gap existing at Γ. The theoretical analysis has been performed in the framework of the fully relativistic version of the one-step model of photoemission [3].

1. J. Kirschner, Polarized electrons at surfaces, Springer, Berlin (1985). 2. R. H. Gaylord et al., PRL 62, 2036 (1989). 3. H. Ebert et al., The Munich SPR-KKR package, version 5.4, http://olymp.cup.uni-muenchen.de/ak/ebert/SPRKKR (2010).