Quadratic Fermi node in a 3D strongly correlated semimetal

Takeshi Kondo; M. Nakayama; R. Chen; J. J. Ishikawa; E. G. Moon; T. Yamamoto; Y. Ota; W. Malaeb; H. Kanai; Y. Nakashima; Y. Ishida; R. Yoshida; H. Yamamoto; M. Matsunami; S. Kimura; N. Inami; K. Ono; H. Kumigashira; S. Nakatsuji; L. Balents; S. Shin

doi:10.1038/ncomms10042

Quadratic Fermi node in a 3D strongly correlated semimetal

Takeshi Kondo, M. Nakayama, R. Chen, J. J. Ishikawa, E. G. Moon, T. Yamamoto, Y. Ota, W. Malaeb, H. Kanai, Y. Nakashima, Y. Ishida, R. Yoshida, H. Yamamoto, M. Matsunami, S. Kimura, N. Inami, K. Ono, H. Kumigashira, S. Nakatsuji, L. BalentsS. Shin

Research output: Contribution to journal › Article › peer-review

84 Citations (Scopus)

Abstract

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 Pr 2 Ir 2 O 7, we identify a non-trivial 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 behaviour is predicted, for which we observe some evidence. Our discovery implies that Pr 2 Ir 2 O 7 is a parent state that can be manipulated to produce other strongly correlated topological phases, such as topological Mott insulator, Weyl semimetal, and quantum spin and anomalous Hall states.

Original language	English
Article number	10042
Journal	Nature communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms10042
Publication status	Published - 2015 Dec 7
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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Kondo, T., 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., ... Shin, S. (2015). Quadratic Fermi node in a 3D strongly correlated semimetal. Nature communications, 6, [10042]. https://doi.org/10.1038/ncomms10042

Quadratic Fermi node in a 3D strongly correlated semimetal. / 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.

In: Nature communications, Vol. 6, 10042, 07.12.2015.

Research output: Contribution to journal › Article › peer-review

Kondo, T, Nakayama, M, Chen, R, Ishikawa, JJ, Moon, EG, 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 2015, 'Quadratic Fermi node in a 3D strongly correlated semimetal', Nature communications, vol. 6, 10042. https://doi.org/10.1038/ncomms10042

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. / Quadratic Fermi node in a 3D strongly correlated semimetal. In: Nature communications. 2015 ; Vol. 6.

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abstract = "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 Pr 2 Ir 2 O 7, we identify a non-trivial 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 behaviour is predicted, for which we observe some evidence. Our discovery implies that Pr 2 Ir 2 O 7 is a parent state that can be manipulated to produce other strongly correlated topological phases, such as topological Mott insulator, Weyl semimetal, and quantum spin and anomalous Hall states.",

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AU - Yamamoto, T.

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AU - Nakashima, Y.

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AU - Yoshida, R.

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AU - Matsunami, M.

AU - Kimura, S.

AU - Inami, N.

AU - Ono, K.

AU - Kumigashira, H.

AU - Nakatsuji, S.

AU - Balents, L.

AU - Shin, S.

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