Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: 2D Materials beyond Graphene: TMDCs, Slicene and Relatives

O 46.10: Poster

Dienstag, 8. März 2016, 18:15–20:30, Poster E

Synthesis and Electronic Structure of Single-Crystal FeSe on Bi₂Se₃ — •Charlotte Sanders¹, Nils Rollfing², Andreas Eich², Fabian Arnold¹, Pascal Ewen², Marco Bianchi¹, Maciej Dendzik¹, Matteo Michiardi¹, Daniel Wegner², Philip Hofmann¹, and Alexander Ako Khajetoorians² — ¹Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark — ²Institute for Molecules and Materials, Radboud University, 6500 GL Nijmegen, Netherlands

Single-layer FeSe on SrTiO₃ exhibits a superconducting transition temperature T_c that is greatly enhanced over that of bulk FeSe. This fact—which is due, in part, to complex physics at the interface of these two materials—raises the question of whether interesting effects can be realised at the interfaces between FeSe and other types of substrates. Recent work has begun to elucidate the structure and electronic properties of single-crystal FeSe islands grown on the topological insulator Bi₂Se₃. Here we extend this line of investigation, combining scanning tunnelling microscopy and low-energy electron diffraction with a detailed mapping of the band structure using angle-resolved photoemission spectroscopy. Remarkably, our findings indicate persistence of the Dirac cone at the FeSe-Bi₂Se₃ interface. We do not observe superconductivity at temperatures down to 4.7K.