Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Metallic Nanowires on Semiconductor Surfaces

O 18.2: Poster

Montag, 7. März 2016, 17:00–19:30, Poster A

Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system — •Monika Jäger, Christian Brand, Herbert Pfnür, and Christoph Tegenkamp — Institut für Festkörperphysik, Leibniz Universität Hannover, Germany

Vicinal Si(557) surfaces covered by 1.31 ML Pb reveal a 1D transport behavior below 78 K [1]. The delicate interplay between the superlattice structure, band filling, and extremely large spin-orbit interaction results in a highly correlated entangled spin- and charge-state. Recent spin resolved ARPES measurements have shown that the insulating behavior across the direction of the wires is associated with the formation of a spin-orbit density wave [2,3].
In order to correlate these findings with the morphology the atomic structure was investigated by means of STM. Adsorption of Pb at 600 K gives rise to a refacetting of the Si surface into a local (223) orientation with an average spacing of 1.58 nm. High resolution STM images have clearly identified √3×√3 reconstructions on the 4 2/3 × 0.332 nm wide (111) terraces. The 0.665 nm periodicity along the terraces is superimposed by an additional intensity modulation which is compatible with a 10-fold periodicity deduced from the spot-splitting seen in former high resolution LEED measurements.
[1] C. Tegenkamp et.al. PRL 95, 176804 (2005).
[2] C. Brand et.al. Nat. Comm. 6, 8118 (2015).
[3] C. Tegenkamp et.al. PRL 109, 266401 (2012).