Observation of flat bands and Dirac cones in a pyrochlore lattice superconductor

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dc.citation.articleNumber71en_US
dc.citation.journalTitlenpj Quantum Materialsen_US
dc.citation.volumeNumber9en_US
dc.contributor.authorHuang, Jianweien_US
dc.contributor.authorSetty, Chandanen_US
dc.contributor.authorDeng, Liangzien_US
dc.contributor.authorYou, Jing-Yangen_US
dc.contributor.authorLiu, Hongxiongen_US
dc.contributor.authorShao, Senen_US
dc.contributor.authorOh, Ji Seopen_US
dc.contributor.authorGuo, Yuchengen_US
dc.contributor.authorZhang, Yichenen_US
dc.contributor.authorYue, Ziqinen_US
dc.contributor.authorYin, Jia-Xinen_US
dc.contributor.authorHashimoto, Makotoen_US
dc.contributor.authorLu, Donghuien_US
dc.contributor.authorGorovikov, Sergeyen_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorDenlinger, Jonathan D.en_US
dc.contributor.authorAllen, J. W.en_US
dc.contributor.authorHasan, M. Zahiden_US
dc.contributor.authorFeng, Yuan-Pingen_US
dc.contributor.authorBirgeneau, Robert J.en_US
dc.contributor.authorShi, Youguoen_US
dc.contributor.authorChu, Ching-Wuen_US
dc.contributor.authorChang, Guoqingen_US
dc.contributor.authorSi, Qimiaoen_US
dc.contributor.authorYi, Mingen_US
dc.contributor.orgRice Center for Quantum Materialsen_US
dc.date.accessioned2024-10-08T13:28:38Zen_US
dc.date.available2024-10-08T13:28:38Zen_US
dc.date.issued2024en_US
dc.description.abstractEmergent phases often appear when the electronic kinetic energy is comparable to the Coulomb interactions. One approach to seek material systems as hosts of such emergent phases is to realize localization of electronic wavefunctions due to the geometric frustration inherent in the crystal structure, resulting in flat electronic bands. Recently, such efforts have found a wide range of exotic phases in the two-dimensional kagome lattice, including magnetic order, time-reversal symmetry breaking charge order, nematicity, and superconductivity. However, the interlayer coupling of the kagome layers disrupts the destructive interference needed to completely quench the kinetic energy. Here we demonstrate that an interwoven kagome network—a pyrochlore lattice—can host a three dimensional (3D) localization of electron wavefunctions. Meanwhile, the nonsymmorphic symmetry of the pyrochlore lattice guarantees all band crossings at the Brillouin zone X point to be 3D gapless Dirac points, which was predicted theoretically but never yet observed experimentally. Through a combination of angle-resolved photoemission spectroscopy, fundamental lattice model and density functional theory calculations, we investigate the novel electronic structure of a Laves phase superconductor with a pyrochlore sublattice, CeRu2. We observe evidence of flat bands originating from the Ce 4f orbitals as well as flat bands from the 3D destructive interference of the Ru 4d orbitals. We further observe the nonsymmorphic symmetry-protected 3D gapless Dirac cone at the X point. Our work establishes the pyrochlore structure as a promising lattice platform to realize and tune novel emergent phases intertwining topology and many-body interactions.en_US
dc.identifier.citationHuang, J., Setty, C., Deng, L., You, J.-Y., Liu, H., Shao, S., Oh, J. S., Guo, Y., Zhang, Y., Yue, Z., Yin, J.-X., Hashimoto, M., Lu, D., Gorovikov, S., Dai, P., Denlinger, J. D., Allen, J. W., Hasan, M. Z., Feng, Y.-P., … Yi, M. (2024). Observation of flat bands and Dirac cones in a pyrochlore lattice superconductor. Npj Quantum Materials, 9(1), 1–10. https://doi.org/10.1038/s41535-024-00683-xen_US
dc.identifier.digitals41535-024-00683-xen_US
dc.identifier.doihttps://doi.org/10.1038/s41535-024-00683-xen_US
dc.identifier.urihttps://hdl.handle.net/1911/117940en_US
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleObservation of flat bands and Dirac cones in a pyrochlore lattice superconductoren_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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