Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Poster Wednesday: Electronic Structure

O 70.2: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

Resolving the electronic surface structure of Lanthanum Hexaboride (001) — •Philipp Buchsteiner¹, Florian Sohn^2,3, Jan Voigt¹, Geetha Balakrishnan⁴, Peter Blöchl^3,2, and Martin Wenderoth¹ — ¹IV. Physikalisches Institut, Georg-August Universität Göttingen, 37077 Göttingen, Germany — ²Institut für Theoretische Physik, Georg-August-Universität Göttingen, 37077 Göttingen, Germany — ³Institut für theoretische Physik, Technische Universität Clausthal, 38678 Clausthal-Zellerfeld, Germany — ⁴Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

As Lanthanum Hexaboride (LaB6) is a wide-spread cathode material for electron emitters, its surface has been studied for a long time [1]. While Scanning Tunneling Microscopy (STM) has shown up to now a (1x1) reconstructed surface [2], only recently a (2x1) reconstruction has been predicted by theory to be the most stable (001)-surface structure [3]. Using UHV low-temperature STM and Scanning Tunneling Spectroscopy (STS) we have investigated the LaB6 (001) cleavage-plane. Our results confirm that atomically ordered surface areas are mostly labyrinth-like (2x1)-reconstructed. Combining STS and slab calculations within the framework of Density Functional Theory (DFT) allows us to further clarify the electronic structure, which is governed by 2pz-orbitals of the boron octahedra. This work is supported by the DFG grant WE1889/10-1 and PR298/19-1. [1] M. Trenary, Sci. Technol. Adv. Mater., 13 (2012) [2] J.S. Ozcomert, M. Trenary, Surf. Sci., 265 (1992) [3] K. M. Schmidt et al., Acta Mater. 144, 187-201 (2018)