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Lundi 24 Mars 2014, 11h
Amphi Holweck, Esc C, 1ème etage
Kondo hybridization and the origin of metallic states at the (001) surface of SmB6
Emmanouil Frantzeskakis
Van der Waals—Zeeman Institute, University of Amsterdam, Amsterdam, Netherlands
Is SmB6 an ideal topological insulator with states of topological character located in a Kondo hybridization gap ? SmB6 could be the first of a new material class of topological Kondo insulators. We present high-resolution ARPES data showing that Kondo hybridization is the key to unraveling the origin of two metallic states observed in the electronic structure of SmB6(001). Both states are localized in the first few layers. Could they be promising candidates for topological surface states ? Before such a claim is substantiated by measuring their massless dispersion relation, our data raises the bar in terms of the energy resolution required, as we uncover strong renormalization of the hybridization gaps compared to theory. Our results map the electronic landscape in SmB6, pointing the way for future work in the quest of Dirac cones in the first topological Kondo insulator [1].
[1] E. Frantzeskakis et al., Phys. Rev. X 3, 041024 (2013).