Kekulé order from diffuse nesting near higher-order Van Hove points
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908880558096384 |
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| author | Beck, Jonas Bodky, Jonathan Dürrnagel, Matteo Thomale, Ronny Ingham, Julian Klebl, Lennart Hohmann, Hendrik |
| author_facet | Beck, Jonas Bodky, Jonathan Dürrnagel, Matteo Thomale, Ronny Ingham, Julian Klebl, Lennart Hohmann, Hendrik |
| contents | Translation symmetry-breaking order is assumed to be suppressed by the lack of Fermi surface nesting near certain higher-order Van Hove singularities (HOVHS). We show the anisotropic band-flattening inherent to such HOVHS, combined with broadening of the Fermi surface due to elevated critical temperatures, results in the Fermi surface becoming approximately nested at a wavevector unrelated to the precise shape of the Fermi surface - leading to a $\sqrt{3}\times\sqrt{3}$ Kekulé density wave formation. The effect is demonstrated using unbiased renormalization group calculations for a model of the breathing kagome lattice. Our mechanism - termed diffuse nesting - represents an entirely new notion in the study of Fermi surface instabilities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_22725 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Kekulé order from diffuse nesting near higher-order Van Hove points Beck, Jonas Bodky, Jonathan Dürrnagel, Matteo Thomale, Ronny Ingham, Julian Klebl, Lennart Hohmann, Hendrik Strongly Correlated Electrons Materials Science Translation symmetry-breaking order is assumed to be suppressed by the lack of Fermi surface nesting near certain higher-order Van Hove singularities (HOVHS). We show the anisotropic band-flattening inherent to such HOVHS, combined with broadening of the Fermi surface due to elevated critical temperatures, results in the Fermi surface becoming approximately nested at a wavevector unrelated to the precise shape of the Fermi surface - leading to a $\sqrt{3}\times\sqrt{3}$ Kekulé density wave formation. The effect is demonstrated using unbiased renormalization group calculations for a model of the breathing kagome lattice. Our mechanism - termed diffuse nesting - represents an entirely new notion in the study of Fermi surface instabilities. |
| title | Kekulé order from diffuse nesting near higher-order Van Hove points |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2505.22725 |