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Quadratic Fermi node in a 3D strongly correlated semimetal [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 10,042 : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
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.
Report Numbers
E 1.99:1255539
Subject(s)
Note
Published through SciTech Connect.
12/07/2015.
"ncomms10042"
Nature Communications 6 ISSN 2041-1723 AM
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.
Funding Information
FG02-08ER46524
DMR 1121053
View MARC record | catkey: 24056432