Evolution of the low energy electronic states in Sm<sub>x</sub>La<sub>(1-x)</sub>B<sub>6</sub> studied by ARPES
ORAL
Abstract
In the recent years, the interplay between topological orders and electronic correlations has attracted the attention of the scientific community. Theoretical works propose SmB6 as a Topological Kondo Insulator in which topologically protected surface states lie within the bulk band gap stemming from the hybridization of localized f-electrons with conduction electrons [1, 2]. However, experimental evidences of the bulk origin of the in gap states have been reported; in particular Z.-H. Zhu et al. observed non-topological surface states originating from B-2p dangling bonds on a polar surface [3]. In order to overcome the complexity in the theoretical interpretations of the ground state of SmB6, we use ARPES to study a wide range of SmxLa(1-x)B6 samples. LaB6 has the same crystal structure of SmB6 and presents qualitatively the same features in the electronic structure, but the lack of f-electrons leads to a metallic ground state. Here we report on the evolution of the low energy electronic states in SmB6 as a function of electronic correlations by gradually varying the stoichiometry of SmxLa(1-x)B6 compounds.
[1] M. Dzero et al., Phys. Rev. Lett. 104, 106408 (2010)
[2] M. Dzero et al., Phys. Rev. B 85, 045130 (2012)
[3] Z.-H. Zhu et al., Phys. Rev. Lett. 111, 216402 (2013)
[1] M. Dzero et al., Phys. Rev. Lett. 104, 106408 (2010)
[2] M. Dzero et al., Phys. Rev. B 85, 045130 (2012)
[3] Z.-H. Zhu et al., Phys. Rev. Lett. 111, 216402 (2013)
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Presenters
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Marta Zonno
- QMI - UBC
- Quantum Matter Institute, Univ. of British Columbia
- Quantum Matter Institute, Univ of British Columbia