Emergent flat band and topological Kondo semimetal driven by orbital-selective correlations

dc.citation.articleNumber5242
dc.citation.journalTitleNature Communications
dc.citation.volumeNumber15
dc.contributor.authorChen, Lei
dc.contributor.authorXie, Fang
dc.contributor.authorSur, Shouvik
dc.contributor.authorHu, Haoyu
dc.contributor.authorPaschen, Silke
dc.contributor.authorCano, Jennifer
dc.contributor.authorSi, Qimiao
dc.date.accessioned2024-08-07T19:15:02Z
dc.date.available2024-08-07T19:15:02Z
dc.date.issued2024
dc.description.abstractFlat electronic bands are expected to show proportionally enhanced electron correlations, which may generate a plethora of novel quantum phases and unusual low-energy excitations. They are increasingly being pursued in d-electron-based systems with crystalline lattices that feature destructive electronic interference, where they are often topological. Such flat bands, though, are generically located far away from the Fermi energy, which limits their capacity to partake in the low-energy physics. Here we show that electron correlations produce emergent flat bands that are pinned to the Fermi energy. We demonstrate this effect within a Hubbard model, in the regime described by Wannier orbitals where an effective Kondo description arises through orbital-selective Mott correlations. Moreover, the correlation effect cooperates with symmetry constraints to produce a topological Kondo semimetal. Our results motivate a novel design principle for Weyl Kondo semimetals in a new setting, viz. d-electron-based materials on suitable crystal lattices, and uncover interconnections among seemingly disparate systems that may inspire fresh understandings and realizations of correlated topological effects in quantum materials and beyond.
dc.identifier.citationChen, L., Xie, F., Sur, S., Hu, H., Paschen, S., Cano, J., & Si, Q. (2024). Emergent flat band and topological Kondo semimetal driven by orbital-selective correlations. Nature Communications, 15(1), 5242. https://doi.org/10.1038/s41467-024-49306-w
dc.identifier.digitals41467-024-49306-w
dc.identifier.doihttps://doi.org/10.1038/s41467-024-49306-w
dc.identifier.urihttps://hdl.handle.net/1911/117613
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.titleEmergent flat band and topological Kondo semimetal driven by orbital-selective correlations
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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