Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 100: Electronic Structure of Surfaces II

O 100.9: Vortrag

Donnerstag, 19. März 2020, 12:30–12:45, REC C 213

Investigation of strong correlation and topological phase in Thulium monochalcogenides TmSe1−xTex — •Simon Müller1, Chul-Hee Min2, Celso Fornari1, Chang-Jong Kang3, Byung Il Min4, Yong Seung Kwon5, and Friedrich Reinert11Institut für Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Germany. — 2IEAP, Christian-Albrechts-Universität zu Kiel, Germany. — 3Departement of Physics and Astronomy, Rutgers University, New Jersey, USA. — 4PCTP, Pohang University of Science and Technology, Republic of Korea. — 5Department of Emerging Materials Science, DGIST, Daegu, Republic of Korea.

To understand the possible interplay between strong correlation and topology it is necessary to find a compound possessing these properties. Surface states with strongly localized 4f character is a good starting point, but the Dirac point has not been clearly identifying by experiments, yet. Our investigation of TmSe1−xTex, which belongs to a mixed valence [1] and is predicted to show a band inversion in our DFT studies, has two main focuses. On the one hand, we try to continuously tune the lattice parameter of the system to a region, which for single crystalline samples was not reachable in ambient pressure, and on the other hand, we want to investigate other facets that are not possible to achieve by cleaving single crystals. In this talk, we will present experimental results of the single crystals but also first results of the grown film. [1] H. Launois, et al., PRL 44, 1271 (1980)

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