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O: Fachverband Oberflächenphysik
O 47: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 47.12: Poster
Tuesday, March 8, 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.