Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 47.12: Poster

Dienstag, 8. März 2016, 18:15–20:30, Poster E

Scanning Tunneling Microscopy study of a newly proposed Topological Insulator ZrTe₅ — •Timo Kuhn¹, Luca Gragnaniello¹, Gabriel Autès², Giulia Manzoni⁴, Alberto Crepaldi³, Fulvio Parmigiani³, Helmuth Berger², Oleg Yazyev², and Mikhail Fonin¹ — ¹Universität Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany — ²Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — ³Elettra-Sincrotrone Trieste, Strada Statale 14, 34149 Basovizza, Trieste, Italy — ⁴Universitá degli Studi di Trieste, Via A. Valerio 2, Trieste 34127, Italy

Topological insulators belong to a new kind of material class that posses robust gapless states inside the insulating bulk gap, which makes them promising candidates for achieving dissipationless transport devices. We present a Scanning tunneling microscopy (STM) and spectroscopy (STS) study on a layered material ZrTe₅, a promising candidate for a new topological insulator. The crystal structure could clearly be identified in topography images. STM measurements enabled direct imaging of standing waves at steps and defects. The standing waves show a clearly dispersive character. Furthermore STS measurements are in good agreement with density functional theory calculations and reveal Landau quantization with applied magnetic field. Comparison with data obtained by angle resolved photoemission spectroscopy allows for detailed insights into the electronic properties of this material.