| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft - Netherlands
[2] Univ Sao Paulo EEL USP, Computat Mat Sci Grp ComputEEL, Escola Engn Lorena, Mat Engn Dept Demar, Lorena, SP - Brazil
[3] Aalto Univ, Dept Appl Phys, Espoo - Finland
Total Affiliations: 3
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| Document type: | Journal article |
| Source: | 2D MATERIALS; v. 8, n. 3 JUL 2021. |
| Web of Science Citations: | 1 |
| Abstract | |
Quasi-flat-bands emerging in buckled monolayer graphene superlattices have been recently shown to realize correlated states analogous to those observed in twisted graphene multilayers. Here, we demonstrate the emergence of valley topology driven by competing electronic correlations in buckled graphene superlattices. We show, both by means of atomistic models and a low-energy description, that the existence of long-range electronic correlations leads to a competition between antiferromagnetic and charge density wave instabilities, that can be controlled by means of screening engineering. Interestingly, we find that the emergent charge density wave has a topologically non-trivial electronic structure, leading to a coexistent quantum valley Hall insulating state. In a similar fashion, the antiferromagnetic phase realizes a spin-polarized quantum valley-Hall insulating state. Our results put forward buckled graphene superlattices as a new platform to realize interaction-induced topological matter. (AU) | |
| FAPESP's process: | 19/07082-9 - Physics of graphene/superconductor junctions |
| Grantee: | Antonio Lucas Rigotti Manesco |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |
| FAPESP's process: | 16/10167-8 - Investigation of electronic and topological properties of superconductor-graphene heterojunctions for applications in quantum computation devices |
| Grantee: | Antonio Lucas Rigotti Manesco |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |