Non-trivial surface states of samarium hexaboride at the (111) surface
| Autor: | Ohtsubo, Y., Yamashita, Y., Hagiwara, K., Ideta, S., Tanaka, K., Yukawa, R., Horiba, K., Kumigashira, H., Miyamoto, K., Okuda, T., Hirano, W., Iga, F., Kimura, S. |
|---|---|
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Nature Communicationsvolume 10, Article number: 2298 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-019-10353-3 |
| Popis: | The peculiar metallic electronic states observed in the Kondo insulator, samarium hexaboride (SmB$_6$), has stimulated considerable attention among those studying non-trivial electronic phenomena. However, experimental studies of these states have led to controversial conclusions mainly to the difficulty and inhomogeneity of the SmB$_6$ crystal surface. Here, we show the detailed electronic structure of SmB$_6$ with angle-resolved photoelectron spectroscopy measurements of the three-fold (111) surface where only two inequivalent time-reversal-invariant momenta (TRIM) exist. We observe the metallic two-dimensional state was dispersed across the bulk Kondo gap. Its helical in-plane spin polarisation around the surface TRIM suggests that SmB$_6$ is topologically non-trivial, according to the topological classification theory for weakly correlated systems. Based on these results, we propose a simple picture of the controversial topological classification of SmB$_6$. Comment: 34 pages, 4 figures for main text; 9 figures for supplementary material |
| Databáze: | arXiv |
| Externí odkaz: |
|