| Autor: |
Kondo, Takeshi, Nakayama, M., Chen, R., Ishikawa, J. J., Moon, E. -G., Yamamoto, T., Ota, Y., Malaeb, W., Kanai, H., Nakashima, Y., Ishida, Y., Yoshida, R., Yamamoto, H., Matsunami, M., Kimura, S., Inami, N., Ono, K., Kumigashira, H., Nakatsuji, S., Balents, L., Shin, S. |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Nature Communications 6, 10042 (2015) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/ncomms10042 |
| Popis: |
Strong spin-orbit coupling fosters exotic electronic states such as topological insulators and superconductors, but the combination of strong spin-orbit and strong electron-electron interactions is just beginning to be understood. Central to this emerging area are the 5d transition metal iridium oxides. Here, in the pyrochlore iridate Pr2Ir2O7, we identify a nontrivial state with a single point Fermi node protected by cubic and time-reversal symmetries, using a combination of angle-resolved photoemission spectroscopy and first principles calculations. Owing to its quadratic dispersion, the unique coincidence of four degenerate states at the Fermi energy, and strong Coulomb interactions, non-Fermi liquid behavior is predicted, for which we observe some evidence. Our discovery implies that Pr2Ir2O7 is a parent state that can be manipulated to produce other strongly correlated topological phases, such as topological Mott insulator, Weyl semi-metal, and quantum spin and anomalous Hall states. |
| Databáze: |
arXiv |
| Externí odkaz: |
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