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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2407.16415 |
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| _version_ | 1866910858360127488 |
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| author | Taguchi, Yuta Hirayama, Motoaki Miyake, Takashi |
| author_facet | Taguchi, Yuta Hirayama, Motoaki Miyake, Takashi |
| contents | We investigate the electronic structure of the kagome lattice model with first, second, and two kinds of third nearest-neighbor hoppings. We reveal that by tuning the third nearest-neighbor hoppings, not only single flat band but also degenerate flat band can be created on the Γ- M line. We provide the detailed conditions to realize them. The coexistence of these bands can be almost realized near the fundamental band gap in graphene with triangular defects in a superhoneycomb arrangement. Furthermore, due to these flat bands, several sharp peaks appear in the optical conductivity. Our results strongly indicate that long-range electron hopping has a new possibility for designing electronic structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_16415 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Designing single and degenerate flat bands in the kagome lattice with long-range hopping Taguchi, Yuta Hirayama, Motoaki Miyake, Takashi Materials Science We investigate the electronic structure of the kagome lattice model with first, second, and two kinds of third nearest-neighbor hoppings. We reveal that by tuning the third nearest-neighbor hoppings, not only single flat band but also degenerate flat band can be created on the Γ- M line. We provide the detailed conditions to realize them. The coexistence of these bands can be almost realized near the fundamental band gap in graphene with triangular defects in a superhoneycomb arrangement. Furthermore, due to these flat bands, several sharp peaks appear in the optical conductivity. Our results strongly indicate that long-range electron hopping has a new possibility for designing electronic structures. |
| title | Designing single and degenerate flat bands in the kagome lattice with long-range hopping |
| topic | Materials Science |
| url | https://arxiv.org/abs/2407.16415 |