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O: Fachverband Oberflächenphysik

O 15: Spin-Orbit Interaction at Surfaces II

O 15.8: Talk

Monday, March 22, 2010, 16:45–17:00, H38

Towards a ferroelectric control of Rashba spin-orbit coupling: Bi on BaTiO₃(001) from first principles — •Hossein Mirhosseini¹, Igor Maznichenko², Samir Abdelouahed¹, Sergey Ostanin¹, Arthur Ernst¹, Ingrid Mertig^1,2, and Jürgen Henk¹ — ¹Max Planck Institute of Microstructure Physics, Halle, Germany — ²Institute of Physics, Martin Luther University Halle-Wittenberg, Halle, Germany

We propose a new route for controling the Rashba splitting of the electronic states of an adlayer. The Rashba spin splitting in the 6p states of a Bi adlayer on BaTiO₃(001) can be manipulated by the electric polarization in the ferroelectric substrate.

The Bi surface states display an anisotropic dispersion with an unmached splitting about 0.2 Å⁻¹. Switching of the intrinsic electric polarization P in BaTiO₃ affects the strength of the Rashba splitting in the Bi adlayer. The relative change in the splitting is about 5 %. Our findings may pave a route for new spinelectronic devices.