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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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O: Fachverband Oberflächenphysik

O 103: Topology and Symmetry Protected Materials I

O 103.8: Talk

Thursday, March 19, 2020, 12:15–12:30, WIL A317

Surface and bulk electronic structure of the 3D topological insulator HgTe(001) — •Raphael Crespo Vidal1, Julia Issing1, Lukas Lunczer2, Giovanni Marini3, Lena Fürst2, Simon Moser4, Giorgio Sangiovanni5, Domenico Di Sante5, Hartmut Buhmann2, Gianni Profeta3, Laurens W. Molenkamp2, Hendrik Bentmann1, and Friedrich Reinert11Experimental Physics VII, University of Würzburg, Germany — 2Experimental Physics III, University of Würzburg, Germany — 3Department of Physical and Chemical Sciences & SPIN-CNR, University of L’Aquila, Italy — 4Experimental Physics IV, University of Würzburg, Germany — 5Theoretical Physics I, University of Würzburg, Germany

Since the discovery of topological insulators HgTe proved itself to be a versatile material system, exhibiting a variety of topologically non-trivial states depending on adjustable structural parameters. Despite its persistent relevance in the field of topological materials a comprehensive understanding of its electronic band structure is still lacking. Here we will present an extensive angle-resolved photoemission (ARPES) study of epitaxially grown HgTe on CdTe(001). The lattice mismatch induces a strain of 0.3% which drives the system in its 3D TI phase. The surface preparation for ARPES was done by cleavage of a Te capping layer as well as in situ transfer. Structural and chemical characterisation by LEED and core-level spectroscopy ensure a pristine surface quality. We find good agreement of our ARPES data with ab initio DFT calculations regarding band positions and dispersions as well as the orbital symmetry of the bands.

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