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.

doi:10.1038/ncomms10042

Title: Quadratic Fermi node in a 3D strongly correlated semimetal

Journal Article · Mon Dec 07 00:00:00 EST 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms10042· OSTI ID:1255539

Kondo, Takeshi ^[1]; Nakayama, M. ^[1]; Chen, R. ^[2]; Ishikawa, J. J. ^[1]; Moon, E. -G. ^[3]; Yamamoto, T. ^[1]; Ota, Y. ^[1]; Malaeb, W. ^[4]; Kanai, H. ^[1]; Nakashima, Y. ^[1]; Ishida, Y. ^[1]; Yoshida, R. ^[1]; Yamamoto, H. ^[1]; Matsunami, M. ^[5]; Kimura, S. ^[6]; Inami, N. ^[7]; Ono, K. ^[7]; Kumigashira, H. ^[7]; Nakatsuji, S. ^[8]; Balents, L. ^[9] more »

Univ. of Tokyo (Japan)
Univ. of California, Santa Barbara, CA (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Santa Barbara, CA (United States); Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea)
Univ. of Tokyo (Japan); Beirut Arab Univ., Beirut (Lebanon)
Institute for Molecular Science, Okazaki (Japan); Toyota Technological Institute, Nagoya (Japan)
Institute for Molecular Science, Okazaki (Japan); Osaka Univ. (Japan)
Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
Univ. of Tokyo (Japan); Japan Science and Technology Agency (JST), Saitama (Japan). PRESTO
Kavli Institute for Theoretical Physics, Santa Barbara, CA (United States)

We report that 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 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. Lastly, 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 semimetal, and quantum spin and anomalous Hall states.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-08ER46524; DMR 1121053

OSTI ID:: 1255539

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 111 works

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Instability caused by the fermion-fermion interactions combined with rotational and particle-hole asymmetries in three-dimensional materials with quadratic band touching Wang, Jing arXiv https://doi.org/10.48550/arxiv.1906.01412	text	January 2019
Magnetic Weyl Semimetal Phase in a Kagome Crystal Liu, D. F.; Liang, A. J.; Liu, E. K. arXiv https://doi.org/10.48550/arxiv.1909.09580	text	January 2019
Erratum: Iridates from the molecular side Pedersen, Kasper S.; Bendix, Jesper; Tressaud, Alain Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms12686	journal	August 2016
Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality Ueda, Kentaro; Oh, Taekoo; Yang, Bohm-Jung Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/ncomms15515	journal	May 2017
Dielectric anomalies and interactions in the three-dimensional quadratic band touching Luttinger semimetal Pr2Ir2O7 Cheng, Bing; Ohtsuki, T.; Chaudhuri, Dipanjan Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-02121-y	journal	December 2017

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