Inversion and Tunability of Van Hove Singularities in $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, and Cs) kagome metals
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917627315617792 |
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| author | Sim, Sangjun Jeong, Min Yong Lee, Hyunggeun Lee, Dong Hyun David Han, Myung Joon |
| author_facet | Sim, Sangjun Jeong, Min Yong Lee, Hyunggeun Lee, Dong Hyun David Han, Myung Joon |
| contents | To understand the alkali-metal-dependent material properties of recently discovered $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, and Cs), we conducted a detailed electronic structure analysis based on first-principles density functional theory calculations. Contrary to the case of $A$ = K and Rb, the energetic positions of the low-lying Van Hove singularities are reversed in CsV$_{3}$Sb$_{5}$, and the characteristic higher-order Van Hove point gets closer to the Fermi level. We found that this notable difference can be attributed to the chemical effect, apart from structural differences. Due to their different orbital compositions, Van Hove points show qualitatively different responses to the structure changes. A previously unnoticed highest lying point can be lowered, locating close to or even below the other ones in response to a reasonable range of bi- and uni-axial strain. Our results can be useful in better understanding the material-dependent features reported in this family and in realizing experimental control of exotic quantum phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_00963 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Inversion and Tunability of Van Hove Singularities in $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, and Cs) kagome metals Sim, Sangjun Jeong, Min Yong Lee, Hyunggeun Lee, Dong Hyun David Han, Myung Joon Superconductivity Strongly Correlated Electrons To understand the alkali-metal-dependent material properties of recently discovered $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, and Cs), we conducted a detailed electronic structure analysis based on first-principles density functional theory calculations. Contrary to the case of $A$ = K and Rb, the energetic positions of the low-lying Van Hove singularities are reversed in CsV$_{3}$Sb$_{5}$, and the characteristic higher-order Van Hove point gets closer to the Fermi level. We found that this notable difference can be attributed to the chemical effect, apart from structural differences. Due to their different orbital compositions, Van Hove points show qualitatively different responses to the structure changes. A previously unnoticed highest lying point can be lowered, locating close to or even below the other ones in response to a reasonable range of bi- and uni-axial strain. Our results can be useful in better understanding the material-dependent features reported in this family and in realizing experimental control of exotic quantum phases. |
| title | Inversion and Tunability of Van Hove Singularities in $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, and Cs) kagome metals |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2404.00963 |