Topology of spin polarization of the 5d states on W(110) and Al/W(110) surfaces

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 sub()) dispersions are identified with an unusual topology: A single spectral branch is spin polarized antisymmetrically relative to the [Gamma] point, and two s...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-07, Vol.86 (3)
Main Authors: Rybkin, A G, Krasovskii, E E, Marchenko, D, Chulkov, E V, Varykhalov, A, Rader, O, Shikin, A M
Format: Article
Language:English
Subjects:
Aluminum
Condensed matter
Dispersions
Photoemission
Polarization
Similarity
Spectra
Topology
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Summary: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 sub()) dispersions are identified with an unusual topology: A single spectral branch is spin polarized antisymmetrically relative to the [Gamma] point, and two spin-polarized branches cross at [Gamma]. The crossing branches disperse linearly but this similarity to a Dirac cone is lost after deposition of the Al, where they acquire a parabolic dispersion. Based on ab initio one-step photoemission theory, 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 polarization of bulk states at the surface, but with a distinct non-Rashba topology.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.035117