Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Low-Dimensional Systems: Oxide Hetero-Interfaces

TT 8.5: Talk

Monday, March 16, 2015, 10:30–10:45, H 3010

Ab initio determination of the spin texture in SrTiO₃ surfaces — •Michaela Altmeyer¹, Klaus Koepernik², Harald O. Jeschke¹, and Roser Valenti¹ — ¹Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany — ²IFW, 01171 Dresden, Germany

The appearance of oxygen vacancies in a surface of strontium titanate has been recently identified to be a likely reason for the formation of a two-dimensional electron gas close to the surface. Lately the first SARPES measurements [1] on these surfaces unveiled an interesting spin texture which shows besides the expected Rashba effect a huge spin splitting that can not be attributed to spin-orbit interaction. Employing density functional theory we therefore examined oxygen deficient slabs and found that indeed magnetism is capable of explaining the measured spin splittings. Moreover we obtain a very rich spin texture where we find not only rotating spins due to the Rashba interaction, but a very complex spin structure most likely caused by an interplay of orbital and spin degrees of freedom.

[1] A.F. Santander-Syro et al., Nature Materials 13, 1085 (2014).