Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Poster Wednesday: Electronic Structure

O 70.6: Poster

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

Experimental Growth and Characterization of Bi:CeAg_x/Ag(111) — •Hendrik Bostelmann-Arp, Katharina Kißner, Chul-Hee Min, and Friedrich Reinert — Julius Maximilians University of Würzburg, 97074 Würzburg

Recent theoretical studies point towards a new class of topologically non trivial materials, where the interplay of electronic correlation and strong spin orbit coupling is the driving force [1, 2]. Nevertheless, the existence of topological features in correlated systems has never been unambiguously clarified. Therefore, a first goal must be to realize materials in which both effects, spin orbit coupling and strong correlation, are observable. Very recently the influence of spin orbit coupling was reported in the substitution series Ce₃Bi₄(Pt_1−xPd_x) (0≤x≤1), where the replacement of the heavier element Pt with the lighter Pd is suggested to induce a Kondo insulator to semimetal transition [3]. In this contribution we propose to merge electronic correlation and strong spin orbit coupling in the epitaxially grown surface alloy Bi:CeAg_x on Ag(111). The surface lattice symmetry is determined by means of Low Energy Electron Diffraction. Furthermore, we investigate the changes in electronic dispersion as well as Ce 3d core level structure by Angle Resolved and X-Ray Photoelectron Spectroscopy. [1] M. Dzero, et al., Phys. Rev. Lett. 104, 106408 (2010) [2] J. Allen, Phil. Mag. 96, 3227 (2016) [3] S. Dzaber, et al., Phys. Rev. Lett. 118, 246601 (2017)