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 Fink^1,2, Emile E. D. Rienks^2,3, Gerhard H. Fecher¹, Stuart S. P. Parkin⁴, Binghai Yan^1,5, and Claudia Felser¹ — ¹Max 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.