Quadratic Fermi node in a 3D strongly correlated semimetal

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 oxi...

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Main Authors:	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.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4686656/

id	pubmed-4686656
recordtype	oai_dc
spelling	pubmed-46866562016-01-07 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. Article 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. 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. Nature Publishing Group 2015-12-07 /pmc/articles/PMC4686656/ /pubmed/26640114 http://dx.doi.org/10.1038/ncomms10042 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	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.
spellingShingle	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
author_facet	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.
author_sort	Kondo, Takeshi
title	Quadratic Fermi node in a 3D strongly correlated semimetal
title_short	Quadratic Fermi node in a 3D strongly correlated semimetal
title_full	Quadratic Fermi node in a 3D strongly correlated semimetal
title_fullStr	Quadratic Fermi node in a 3D strongly correlated semimetal
title_full_unstemmed	Quadratic Fermi node in a 3D strongly correlated semimetal
title_sort	quadratic fermi node in a 3d strongly correlated semimetal
description	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. 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.
publisher	Nature Publishing Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4686656/
_version_	1613515238293897216

Quadratic Fermi node in a 3D strongly correlated semimetal

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