Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Poster Tuesday: Electronic Structure

O 43.8: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Investigation of honeycomb Na₂IrO₃ surface structures by functionalized STM and STS probes — •Thomas Dziuba¹, Ina Pietsch², Philipp Gegenwart², and Martin Wenderoth¹ — ¹IV. Physikalisches Institut, Georg-August-Universität Göttingen, Germany — ²Lehrstuhl für Experimentalphysik VI, Universität Augsburg, Germany

Na₂IrO₃ is a prototypical Kitaev material in the iridate family, consisting of alternating stacks of negatively charged honeycomb Ir₂NaO₆ layers and positively charged hexagonal Na₃ layers [1]. In addition to its frustrated magnetic bulk properties, Na₂IrO₃ has also been discussed as host of topological electronic surface states. However, since most studies focus on bulk magnetic properties, information on the surface electronic structure is still rather limited. We report a thorough study of the structural and electronic properties of in-situ cleaved surfaces by atomic resolution scanning tunneling microscopy and spectroscopy. Based on our previous study of surface reconstructions [2], we now concentrate our attention on a detailed investigation of the differences between the bulk and surface electronic properties. We deeply study the influence of alkali metal functionalized tips and report the interrelation between surface reconstructions, the local electronic structure and the tip status.

Work supported by DFG through SPP 1666 (Topological Insulators).

References:

[1] Y. Singh and P. Gegenwart, Phys. Rev. B 82, 064412 (2010)

[2] F. Lüpke et al., Phys. Rev. B 91, 041405(R) (2015)