Current Vortices in graphene-based quantum dots: effects of curvatures and electron-electron interactions

ORAL

Abstract

Carbon-based structures such as nanotubes and, more recently, graphene, have attracted significant attention from the scientific community, both for their fundamental interest and potential applications in photonics and electronics. Graphene, in particular, has extraordinary strength and exceptional electrical and thermal transport properties. Recently, curved graphene-based nanostructures have shown great promise for advancing new technologies. Understanding how curvature affects their electronic properties is crucial. Here, we study the behavior of current vortices of a graphene nanoflake under different curvatures. Our method combines a tight-binding model with π-Orbital Axis Vector (POAV) theory, non-equilibrium Green’s function, and a molecular orbital description. We outline the necessary conditions for the emergence of these currents, and also assess their robustness against lattice defects1 and electron-electron interactions which lead to the presence of incoherent currents2.

1Eudes Gomes and Fernando Moraes, Phys. Rev. B 104, 165408

2Washington F dos Santos et al 2025 Nanotechnology 36 025201

*Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Ciência e Tecnologia de Pernambuco (FACEPE)Centro Nacional de Processamento de Alto Desempenho em São Paulo (CENAPAD-SP)GRIDUNESP.

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Presenters

  • Washington F dos Santos

    • Instituto de Física Teórica, Sao Paulo State University

Authors

  • Washington F dos Santos

    • Instituto de Física Teórica, Sao Paulo State University

  • Eudes T Gomes da Silva

    • University of Iowa

  • Fernando Moraes

    • Universidade Federal Rural de Pernambuco

  • Alexandre R Rocha

    • Instituto de Fisica Teorica - UNESP

  • Denis R Candido

    • University of Iowa