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

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dc.citation.articleNumber71
dc.citation.journalTitlenpj Quantum Materials
dc.citation.volumeNumber9
dc.contributor.authorHuang, Jianwei
dc.contributor.authorSetty, Chandan
dc.contributor.authorDeng, Liangzi
dc.contributor.authorYou, Jing-Yang
dc.contributor.authorLiu, Hongxiong
dc.contributor.authorShao, Sen
dc.contributor.authorOh, Ji Seop
dc.contributor.authorGuo, Yucheng
dc.contributor.authorZhang, Yichen
dc.contributor.authorYue, Ziqin
dc.contributor.authorYin, Jia-Xin
dc.contributor.authorHashimoto, Makoto
dc.contributor.authorLu, Donghui
dc.contributor.authorGorovikov, Sergey
dc.contributor.authorDai, Pengcheng
dc.contributor.authorDenlinger, Jonathan D.
dc.contributor.authorAllen, J. W.
dc.contributor.authorHasan, M. Zahid
dc.contributor.authorFeng, Yuan-Ping
dc.contributor.authorBirgeneau, Robert J.
dc.contributor.authorShi, Youguo
dc.contributor.authorChu, Ching-Wu
dc.contributor.authorChang, Guoqing
dc.contributor.authorSi, Qimiao
dc.contributor.authorYi, Ming
dc.contributor.orgRice Center for Quantum Materials
dc.date.accessioned2024-10-08T13:28:38Z
dc.date.available2024-10-08T13:28:38Z
dc.date.issued2024
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.
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-x
dc.identifier.digitals41535-024-00683-x
dc.identifier.doihttps://doi.org/10.1038/s41535-024-00683-x
dc.identifier.urihttps://hdl.handle.net/1911/117940
dc.language.isoeng
dc.publisherSpringer Nature
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.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleObservation of flat bands and Dirac cones in a pyrochlore lattice superconductor
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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