Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 67: Electronic structure of surfaces: Spectroscopy, surface states III

O 67.7: Talk

Wednesday, March 14, 2018, 17:00–17:15, MA 042

First-principles study on the bulk and surface Rashba states of GeTe — •Jaemo Lihm and Cheol-Hwan Park — Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea

GeTe displays giant bulk and surface Rashba-type spin splitting as a result of its ferroelectric polarization and strong spin-orbit coupling [1,2]. The energy and spin polarization of the bulk and surface Rashba states of GeTe has been closely studied both theoretically and experimentally, due to its potential in the external control of electron spin [3]. In this presentation, we report the results of our first-principles study on the electronic structure of bulk and surface Rashba split bands using density-functional-theory calculations. We find the different roles of broken inversion symmetry and the spin-orbit coupling in the Rashba effect of GeTe. The bulk-surface resonance effect brings about complexity in the electronic structure of the surface Rashba states. The effects of potassium adsorption on the surface Rashba states are also investigated.

[1] D. Di Sante et al., Adv. Mater. 25, 509-513 (2013)

[2] M. Liebmann et al., Adv. Mater. 28, 560-565 (2016)

[3] J. Krempaský et al., arXiv:1707.08431 (2017)