title: CeRu4Sn6: a strongly correlated material with nontrivial topology.
abstract: Topological insulators form a novel state of matter that provides new opportunities to create unique quantum phenomena. While the materials used so far are based on semiconductors, recent theoretical studies predict that also strongly correlated systems can show non-trivial topological properties, thereby allowing even the emergence of surface phenomena that are not possible with topological band insulators. From a practical point of view, it is also expected that strong correlations will reduce the disturbing impact of defects or impurities, and at the same increase the Fermi velocities of the topological surface states. The challenge is now to discover such correlated materials. Here, using advanced x-ray spectroscopies in combination with band structure calculations, we infer that CeRu4Sn6 is a strongly correlated material with non-trivial topology.
authors.affiliation: Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Sundermann
authors.affiliation: Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany.
authors.forename: Fabio
authors.initials: F
authors.lastname: Strigari
authors.affiliation: Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Willers
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Hannes
authors.initials: H
authors.lastname: Winkler
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Andrey
authors.initials: A
authors.lastname: Prokofiev
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cédex, France.
authors.forename: James M
authors.initials: JM
authors.lastname: Ablett
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cédex, France.
authors.forename: Jean-Pascal
authors.initials: JP
authors.lastname: Rueff
authors.affiliation: Helmholtz-Zentrum Berlin, BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany.
authors.forename: Detlef
authors.initials: D
authors.lastname: Schmitz
authors.affiliation: Helmholtz-Zentrum Berlin, BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany.
authors.forename: Eugen
authors.initials: E
authors.lastname: Weschke
authors.affiliation: European Synchrotron Radiation Facility (ESRF), B.P. 220, 38043 Grenoble Cédex, France.
authors.forename: Marco Moretti
authors.initials: MM
authors.lastname: Sala
authors.affiliation: European Synchrotron Radiation Facility (ESRF), B.P. 220, 38043 Grenoble Cédex, France.
authors.forename: Ali
authors.initials: A
authors.lastname: Al-Zein
authors.affiliation: Department of Quantum Matter, ADSM Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Arata
authors.initials: A
authors.lastname: Tanaka
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187 Dresden, Germany.
authors.forename: Maurits W
authors.initials: MW
authors.lastname: Haverkort
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187 Dresden, Germany.
authors.forename: Deepa
authors.initials: D
authors.lastname: Kasinathan
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187 Dresden, Germany.
authors.forename: Liu Hao
authors.initials: LH
authors.lastname: Tjeng
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Silke
authors.initials: S
authors.lastname: Paschen
authors.affiliation: Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany.
authors.forename: Andrea
authors.initials: A
authors.lastname: Severing