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Spin-orbit influence on dz2-type surface state at Ta(110)
Univ Munster, Inst Phys, D-48149 Munster, Germany..
Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan..
Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany..
Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan..
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2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 16, 161408Article in journal (Refereed) Published
Abstract [en]

The influence of spin-orbit interaction on an occupied surface state at Ta(110) is investigated with spin-and angle-resolved photoemission and electronic structure calculations. The surface state appears in a symmetry gap at a binding energy of 0.45 eV at (sic) and exhibits a free-electron-like E(k(parallel to)) dispersion with an effective mass m*/m(e) of about -1.35 along (Gamma) over bar(H) over bar. Photoemission results for excitation with s- and p-polarized light confirm the predicted d(z2)-type symmetry of the state close to (Gamma) over bar. Spin-resolved data for finite k(parallel to) reveal a pure Rashba-type spin texture with a Rashba parameter of 0.063 +/- 0.007 eV A. These findings clearly prove a sizable impact of spin-orbit coupling on the d(z2) surface state and resolve a longstanding disagreement on this issue.

Place, publisher, year, edition, pages
2015. Vol. 92, no 16, 161408
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Physical Sciences
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URN: urn:nbn:se:uu:diva-267212DOI: 10.1103/PhysRevB.92.161408ISI: 000363013600001OAI: oai:DiVA.org:uu-267212DiVA: diva2:872473
Available from: 2015-11-19 Created: 2015-11-19 Last updated: 2017-12-01Bibliographically approved

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Thonig, Danny

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