Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 16: Surface State Spectroscopy II

O 16.6: Vortrag

Montag, 7. März 2016, 16:15–16:30, H4

Rashba Spin-Orbit Coupling in the Presence of Ferroelectricity: Ultrathin Bi-films on BaTiO3 (001) — •Peter Lutz, Tim Figgemeier, Hendrik Bentmann, and Friedrich Reinert — Experimentelle Physik VII and Röntgen Research Center for Complex Materials (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

The merging of two different material systems with specific physical properties provides a promising way to explore unique and new functunalities. In the case of ultrathin Bismuth (Bi) films on Barium Titanate (BTO) it was theoretically shown that the electric polarization of the ferroelectric substrate allows to manipulate the Rashba split Bi 6p states at the Fermi level [1]. By highly-ordered film growth we experimentally realized the formation of spin-orbit split surface states on ferroelectric BTO. The electronic structure looks similar to the one of pure Bi(111) or Bi/Si(111) but the films on BTO grow in thicknesses down to two bilayers [2]. This enables an enhanced coupling between the substrate and the Bi states. In our angle-resolved photoelectron spectroscopy (ARPES) data we investigated changes in the electronic structure of the electronic states when the ferroelectric substrate is driven through its structural phase transition [3]. Due to its capability of manipulating spin split states Bi/BTO may be regarded as a model system in realizing spintronic devices.

[1] H. Mirhosseini et al., Phys. Rev. B, 81, 073406, (2010) [2] T. Hirahara et al., Phys. Rev. Lett., 97, 146803 (2006) [3] W. Zhong et al., Phys. Rev. Lett., 73, 1861 (1994)