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 and S. Shin
Additional contact information
Takeshi Kondo: ISSP, University of Tokyo
M. Nakayama: ISSP, University of Tokyo
R. Chen: University of California
J. J. Ishikawa: ISSP, University of Tokyo
E.-G. Moon: University of California
T. Yamamoto: ISSP, University of Tokyo
Y. Ota: ISSP, University of Tokyo
W. Malaeb: ISSP, University of Tokyo
H. Kanai: ISSP, University of Tokyo
Y. Nakashima: ISSP, University of Tokyo
Y. Ishida: ISSP, University of Tokyo
R. Yoshida: ISSP, University of Tokyo
H. Yamamoto: ISSP, University of Tokyo
M. Matsunami: UVSOR Facility, Institute for Molecular Science
S. Kimura: UVSOR Facility, Institute for Molecular Science
N. Inami: Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
K. Ono: Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
H. Kumigashira: Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
S. Nakatsuji: ISSP, University of Tokyo
L. Balents: Kavli Institute for Theoretical Physics
S. Shin: ISSP, University of Tokyo

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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 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.

Date: 2015
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DOI: 10.1038/ncomms10042

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