Correlation-induced valley topology in buckled graphene superlattices

Autor(es)

Manesco, Antonio L. R. ^{[1, 2]} ; Lado, Jose L. ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: 2D MATERIALS; v. 8, n. 3 JUL 2021.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 19/07082-9 - Física de junções grafeno/supercondutor
• Beneficiário: Antonio Lucas Rigotti Manesco
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 16/10167-8 - Investigação de propriedades eletrônicas e topológicas de heterojunções supercondutor-grafeno para aplicações em dispositivos de computação quântica
• Beneficiário: Antonio Lucas Rigotti Manesco
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto