Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Electronic structure of surfaces: Spectroscopy, surface states IV

O 90.4: Vortrag

Donnerstag, 15. März 2018, 11:15–11:30, MA 042

Spin-polarization of the two-dimensional electron gas at CaTiO₃ film surfaces — •Eduardo B. Guedes^1,2, Stefan Muff^1,2, Milan Radovic^2,3, and J. Hugo Dil^1,3 — ¹Institut de Physique, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland — ²Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland — ³SwissFel, Paul Scherrer Institut, 5232 Villigen, Switzerland

The perovskite CaTiO₃ was recently added to the group of oxides hosting a metallic surface state [1], which in this case consists exclusively of 2-dimensional electron gas (2DEG). We investigated films of CaTiO₃ grown by pulsed laser deposition by means of spin- and angle-resolved photoelectron spectroscopy (SARPES). Our results show that the surface state is clearly split into two bands, which present spin polarization consistent with a Rashba-like splitting. Further, possible spin-interference effects [2] are also seen in the spectra, and different scenarios for the role of spin in dipole selection rules will be discussed.

References:

[1] S. Muff et al., Observation of a two-dimensional electron gas at CaTiO₃ film surfaces, Appl. Surf. Sci. (2017), http://dx.doi.org/10.1016/j.apsusc.2017.05.229.

[2] U. Heinzmann and J. H. Dil, J. Phys.: Condens. Matter 24, 173001 (2012).