E138-04 - Forschungsbereich Quantum Materials E138 - Institut für Festkörperphysik
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ArXiv ID:
2212.08017
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Date (published):
21-Dec-2022
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Preprint Server:
arXiv
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Keywords:
solid state physics; intermetallic compounds; strongly correlated electron systems
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Abstract:
Flat 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 locat...
Flat 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.
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Project title:
Quantum phase transitions and collective modes: I 5868-N (FWF Fonds zur Förderung der wissenschaftlichen Forschung (FWF)) Correlation-driven metallic topology: 101055088 (European Commission)
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Research Areas:
Materials Characterization: 18% Quantum Many-body Systems Physics: 82%