Guardado en:
| Autores principales: | , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2512.11137 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866918245594824704 |
|---|---|
| author | Espitia, Giovanny Lee, Seung Hun Chiu, Calvin Kaiyu Ahn, Junyeong Naik, Mit H. |
| author_facet | Espitia, Giovanny Lee, Seung Hun Chiu, Calvin Kaiyu Ahn, Junyeong Naik, Mit H. |
| contents | Two-dimensional moiré materials offer a powerful, twist-tunable platform for engineering electronic bands and correlations, though most studies to date have focused on small twist angles where flat bands arise from symmetry-pinned monolayer momenta. Here, we observe the surprising emergence of flat electronic bands with a distinctive quasi-one-dimensional dispersion at large twist angles in bilayer transition metal dichalcogenides that originate from the $Λ$ valley states at generic momenta between $Γ$ and $K$ points. These taco-shaped anisotropic bands result from optimal interlayer hybridization between like-spin $Λ$ valleys at the conduction band minimum in the Brillouin zone, resulting in directional band flattening at a magic twist-angle of 21.8$^{\circ}$. The bands form six anisotropic channels with a sixfold alternating spin texture reminiscent of altermagnetic textures. At low energies, the density of states shows a power-law dependence due to the quasi-one-dimensional character, enhancing the potential for correlated phases. Our results provide a new platform for correlated phenomena and broaden the scope of moiré engineering to large twist angles in 2D materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11137 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quasi-one-dimensional taco-shaped bands in large-angle twisted bilayer transition metal dichalcogenides Espitia, Giovanny Lee, Seung Hun Chiu, Calvin Kaiyu Ahn, Junyeong Naik, Mit H. Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Two-dimensional moiré materials offer a powerful, twist-tunable platform for engineering electronic bands and correlations, though most studies to date have focused on small twist angles where flat bands arise from symmetry-pinned monolayer momenta. Here, we observe the surprising emergence of flat electronic bands with a distinctive quasi-one-dimensional dispersion at large twist angles in bilayer transition metal dichalcogenides that originate from the $Λ$ valley states at generic momenta between $Γ$ and $K$ points. These taco-shaped anisotropic bands result from optimal interlayer hybridization between like-spin $Λ$ valleys at the conduction band minimum in the Brillouin zone, resulting in directional band flattening at a magic twist-angle of 21.8$^{\circ}$. The bands form six anisotropic channels with a sixfold alternating spin texture reminiscent of altermagnetic textures. At low energies, the density of states shows a power-law dependence due to the quasi-one-dimensional character, enhancing the potential for correlated phases. Our results provide a new platform for correlated phenomena and broaden the scope of moiré engineering to large twist angles in 2D materials. |
| title | Quasi-one-dimensional taco-shaped bands in large-angle twisted bilayer transition metal dichalcogenides |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.11137 |