Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 34: Poster Session - Topological Insulators
O 34.7: Poster
Monday, March 16, 2020, 18:15–20:00, P1C
Photoelectron spectroscopy on thin Fe(Se,Te) superconductor films on Bi-based topological insulators — •Philipp Kagerer, Thiago R. F. Peixoto, Simon Müller, Ali Aljanabi, Celso Fornari, Hendrik Bentmann, and Friedrich Reinert — Experimental Physics VII, Julius Maximilian University of Würzburg
It has been shown that the electronic properties of thin layers of Fe-based superconductors can be manipulated by the choice of the substrate material. This includes an enhancement of Tc, e.g. as reported on SrTiO3, as well as possible novel topological phases [1,2]. Owing to its simple cubic structure and good growth properties, thin layers of Fe(Se,Te) on a Bi-based three-dimensional topological insulator (TI) pose a promising platform for the research on superconductor-TI interface systems.
Here we report on the epitaxial growth and characterization of thin layers of Fe(Se,Te) on the nearly lattice matched quaternary (Bi,Sb)2(Se,Te)3 TI single-crystal. LEED and XPS experiments, as well as STM and STS measurements, confirm the formation of a few monolayers of Fe(Se,Te) on top of the TI substrate. Using ARPES, we show the arising of the FeSeTe valence bands near the Fermi level, along with the heavily n-doped band structure of the underlying TI. In addition, photon-energy-dependent and resonant measurements using synchrotron radiation allow a distinction between substrate and overlayer bands, and show indications for strong electron correlation and a Hubbard-gap in the material.
[1] Liu D.F., Nat comm 3, 931(2012)
[2] Beenakker, C.W.J., Annu. Rev. Condens. Matter. Phys., 4 (2013)