Topological Semimetal driven by Strong Correlations and Crystalline Symmetry
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2021
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| _version_ | 1866912270238351360 |
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| author | Chen, Lei Setty, Chandan Hu, Haoyu Vergniory, Maia G. Grefe, Sarah E. Fischer, Lukas Yan, Xinlin Eguchi, Gaku Prokofiev, Andrey Paschen, Silke Cano, Jennifer Si, Qimiao |
| author_facet | Chen, Lei Setty, Chandan Hu, Haoyu Vergniory, Maia G. Grefe, Sarah E. Fischer, Lukas Yan, Xinlin Eguchi, Gaku Prokofiev, Andrey Paschen, Silke Cano, Jennifer Si, Qimiao |
| contents | Electron correlations amplify quantum fluctuations and, as such, they have been recognized as the origin of a rich landscape of quantum phases. Whether and how they lead to gapless topological states is an outstanding question, and a framework that allows for determining novel phases and identifying new materials is in pressing need. Here we advance a general approach, in which strong correlations cooperate with crystalline symmetry to drive gapless topological states. We test this materials design principle by exploring Kondo lattice models and materials whose space group symmetries may promote different kinds of electronic degeneracies, with a particular focus on square-net systems. Weyl-Kondo nodal-line semimetals -- with nodes pinned to the Fermi energy -- are identified. We describe how this approach can be applied to discover strongly correlated topological semimetals, identify three heavy fermion compounds as new candidates, provide first direct experimental evidence for our prediction in Ce$_2$Au$_3$In$_5$, and discuss how our approach may lead to many more. Our findings illustrate the potential of the proposed materials design principle to guide the search for new topological metals in a broad range of strongly correlated systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2107_10837 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Topological Semimetal driven by Strong Correlations and Crystalline Symmetry Chen, Lei Setty, Chandan Hu, Haoyu Vergniory, Maia G. Grefe, Sarah E. Fischer, Lukas Yan, Xinlin Eguchi, Gaku Prokofiev, Andrey Paschen, Silke Cano, Jennifer Si, Qimiao Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science Electron correlations amplify quantum fluctuations and, as such, they have been recognized as the origin of a rich landscape of quantum phases. Whether and how they lead to gapless topological states is an outstanding question, and a framework that allows for determining novel phases and identifying new materials is in pressing need. Here we advance a general approach, in which strong correlations cooperate with crystalline symmetry to drive gapless topological states. We test this materials design principle by exploring Kondo lattice models and materials whose space group symmetries may promote different kinds of electronic degeneracies, with a particular focus on square-net systems. Weyl-Kondo nodal-line semimetals -- with nodes pinned to the Fermi energy -- are identified. We describe how this approach can be applied to discover strongly correlated topological semimetals, identify three heavy fermion compounds as new candidates, provide first direct experimental evidence for our prediction in Ce$_2$Au$_3$In$_5$, and discuss how our approach may lead to many more. Our findings illustrate the potential of the proposed materials design principle to guide the search for new topological metals in a broad range of strongly correlated systems. |
| title | Topological Semimetal driven by Strong Correlations and Crystalline Symmetry |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2107.10837 |