SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Poster Session V: Electronic structure of surfaces: Spectroscopy, surface states III
O 64.3: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Unconventional Surface Conductivity in Correlated Honeycomb Transition Metal Oxide Mott Insulators — •Thomas Dziuba1, Máté Stark1, Ina Pietsch2, Philipp Gegenwart2, and Martin Wenderoth1 — 1IV. Physikalisches Institut, Georg-August Universität Göttingen, Germany — 2Lehrstuhl für Experimentalphysik VI, Zentrum für Elektronische Korrelationen und Experimentalphysik, Universität Augsburg, Germany
The correlated honeycomb transition metal oxides attract large attention for the theoretical prospect of topological non-triviality as well as being a possible realization of the magnetic Kitaev exchange model. The Mott insulating sodium iridate Na2IrO3 is prototypical among these materials with the potential to bridge the field of strongly correlated systems with topology [1]. By using home-built STM and STS combined with macroscopic conductivity measurements of freshly cleaved Na2IrO3 surfaces in UHV we measure the properties provided by the sample surface. We report on the rather unconventional linear-dispersion in-gap conductivity found by tunneling spectroscopy. The addressability of such states strongly depends on the electronic properties of the probe and local surface structures. We will further discuss the found conductivity of the Na2IrO3 surface in the light of macroscopic measurements, complementing previous (bulk) results [2]. We thank the Deutsche Forschungsgemeinschaft for financial support via projects 220179758 (SPP 1666) and 107745057 (TRR 80).
References: [1] Phys. Rev. B 91, 041405(R) (2015), [2] Phys. Rev. B 82, 064412 (2010)