Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 108: Topological Superconductors
TT 108.3: Vortrag
Freitag, 16. März 2018, 10:00–10:15, H 2053
The Electronic Structure and Transport Properties of Niobium Doped Bismuth Selenide — •Henriette Elisabeth Lund1, Marco Bianchi1, Simone Munkholm Kevy2, Laura Wollesen2, Martin Bremholm2, Mark Jonas Haastrup1, Elze Jantien Knol3, Alexander Ako Khajetoorians3, Steffen Wiedmann4, and Philip Hofmann1 — 1Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNano), Aarhus University, 8000 Aarhus C, Denmark — 2Center for Materials Crystallography, Department of Chemistry and iNano, Aarhus University, 8000 Aarhus C, Denmark — 3Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands — 4High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands
It is believed that topological superconductivity can be realized in bismuth selenide, Bi2Se3, doped with Cu, Sr, and Nb. Little is known about the properties of Nb doped Bi2Se3. In the present study, the electronic structure and transport properties of NbxBi2Se3 have been investigated. Angle-resolved photoemission spectroscopy, scanning tunneling microscopy and atomic force microscopy measurements point towards an inhomogeneous surface structure. Transport measurements show that samples become partly superconducting with the critical temperature ranging between 2.3 K and 3.2 K. The results indicate that the NbxBi2Se3 system crystallizes in an inhomogeneous manner which makes it challenging to understand the origin of the superconductivity and motivates further work on this project.