Chiral model of twisted bilayer graphene realized in a monolayer
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910299012988928 |
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| author | Crépel, Valentin Dunbrack, Aaron Guerci, Daniele Bonini, John Cano, Jennifer |
| author_facet | Crépel, Valentin Dunbrack, Aaron Guerci, Daniele Bonini, John Cano, Jennifer |
| contents | We demonstrate that a single layer of graphene subject to a superlattice potential nearly commensurate to a $\sqrt{3} \times \sqrt{3}$ supercell exactly maps to the chiral model of twisted bilayer graphene, albeit with half as many degrees of freedom. We comprehensively review the properties of this ``half-chiral model,'' including the interacting phases stabilized at integer fillings and the effects of substrate-induced symmetry breaking. We list candidate substrates that could produce a superlattice potential on graphene with the correct periodicity to access the flat band limit. Experimental measurements on a half-chiral moire heterostructure, in which valley-skyrmions cannot form, could yield insights on the physics they mediate in twisted bilayer graphene. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_14423 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Chiral model of twisted bilayer graphene realized in a monolayer Crépel, Valentin Dunbrack, Aaron Guerci, Daniele Bonini, John Cano, Jennifer Mesoscale and Nanoscale Physics Strongly Correlated Electrons We demonstrate that a single layer of graphene subject to a superlattice potential nearly commensurate to a $\sqrt{3} \times \sqrt{3}$ supercell exactly maps to the chiral model of twisted bilayer graphene, albeit with half as many degrees of freedom. We comprehensively review the properties of this ``half-chiral model,'' including the interacting phases stabilized at integer fillings and the effects of substrate-induced symmetry breaking. We list candidate substrates that could produce a superlattice potential on graphene with the correct periodicity to access the flat band limit. Experimental measurements on a half-chiral moire heterostructure, in which valley-skyrmions cannot form, could yield insights on the physics they mediate in twisted bilayer graphene. |
| title | Chiral model of twisted bilayer graphene realized in a monolayer |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2305.14423 |