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Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 45: Poster IV: One-Dimensional Metals: Reality or Fiction

DS 45.10: Poster

Thursday, April 3, 2014, 16:00–19:00, P1

Spin-Polarization and Spin-Orbit Coupling in Au-Induced Atom Chains on High-Index Silicon Surfaces — •Julian Aulbach1, Jörg Schäfer1, Steven C. Erwin2, Sebastian Meyer1, Lenart Dudy1, Bartosz Slomsik3, Gabriel Landolt3, Hugo Dil3, and Ralph Claessen31Physikalisches Institut and Röntgen Center for Complex Materials Systems (RCCM), Universität Würzburg, Germany — 2Naval Research Laboratory, Washington DC, USA — 3Paul Scherrer Institut, Villigen, Switzerland

Atoms can form chain-like architectures by self-assembly on various semiconductor surfaces. Such may offer physical realizations of 1D electronic ground states like Peierls instabilities or Tomonaga-Luttinger liquids. Here we report on Au-stabilized nanowires on a high-index silicon substrate, namely Si(553). The two chain types present in that system, one built by Au and one by Si atoms, develop two- and threefold periodicities at low temperatures, which were previously assigned to Peierls instabilities. However, our results from scanning tunneling microscopy and spectroscopy are in astounding agreement with the Si(553)-Au ground state predicted by density-functional theory , where every third Si atom is spin polarized [1]. Moreover, the structural model [2] suggests strong spin-orbit coupling for the Au chains. Using spin- and angle-resolved photoemission we find direct evidence for such a spin-splitting in both Au-induced bands, rendering this system an intriguing 1D material with spin ordering in real and reciprocal space.

[1] J. Aulbach et al., Phys. Rev. Lett. 111, 137203 (2013).

[2] S. C. Erwin and F. J. Himpsel, Nature Commun. 1, 58 (2010).

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