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O: Fachverband Oberflächenphysik

O 34: Poster Session - Topological Insulators

O 34.6: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

Photoemission Study on the Three Dimensional Topological Insulator HgTe(001) — •Julia Issing¹, Raphael Crespo Vidal¹, Lukas Lunczer², Lena Fürst², Simon Moser³, Hartmut Buhmann², Laurens W. Molenkamp², Hendrik Bentmann¹, and Friedrich Reinert¹ — ¹Experimental Physics VII, University of Würzburg — ²Experimental Physics III, University of Würzburg — ³Experimental Physics IV, University of Würzburg

Mercury Telluride (HgTe) is a paradigmatic topological material that plays a key role in the exploration of topological physics in solids. For example, it is known to behave as a topological insulator under tensile strain and as a Weyl semimetal under compressive strain. In this contribution, we present the chemical and structural characterization of the (001)-surface of HgTe films grown by molecular beam epitaxy. The films are grown along the (001)-direction on a CdTe(001)-substrate, which induces a tensile strain. By means of LEED, we studied the surface geometric structure indicating a (2x1) reconstruction. Furthermore, the chemical composition of HgTe films is examined with XPS. The topologically non-trivial electronic structure was investigated by studying the angle resolved valence-band photoemission spectra of HgTe(001) using excitation with HeI_α as well as synchrotron radiation.