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Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 100: Electronic Structure of Surfaces: Spectroscopy, Surface States II

O 100.4: Talk

Thursday, March 23, 2017, 16:45–17:00, WIL C307

Multiple Dirac cones at the surface of the topological metal LaBi — •Jayita Nayak1, Shu-Chun Wu1, Nitesh Kumar1, Chandra Shekhar1, Sanjay Singh1, Jörg Fink1,2, Emile E. D. Rienks2,3, Gerhard H. Fecher1, Stuart S. P. Parkin4, Binghai Yan1,5, and Claudia Felser11Max Planck Institut CPFS, Dresden, Germany — 2Leibniz Institut fur Festkorper- und Werkstoffforschung IFW Dresden, Dresden, Germany — 3Institute of Solid State Physics, Dresden University of Technology, Dresden, Germany — 4Max Planck Institute for Microstructure Physics, Halle, Germany — 5Max Planck Institute for Physics of Complex Systems, Dresden, Germany

The rare-earth monopnictide LaBi, LaSb exhibits very large, unusual magnetoresistance which stimulates the interest in directly observing any topological surface states. Although band inversions have been postulated to induce a topological phase in LaBi but there were no experimental evidence for topological surface states in this compound. By using angle-resolved photoemission spectroscopy (ARPES) and ab initio calculations, we have revealed the existence of topological surface states of LaBi through the observation of three Dirac cones: two coexist at the corners and one appears at the center of the Brillouin zone. The odd number of surface Dirac cones is a direct proof of the topological nature of LaBi compound. Our results afford insight of the topological surface states of LaBi and semi-metallicity and related magneto-transport properties.

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