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https://hdl.handle.net/1822/68513
Título: | Topological magnons in CrI3 monolayers: an itinerant fermion description |
Autor(es): | Costa, A. T. Santos, D. L. R. Peres, N. M. R. Fernández-Rossier, J. |
Palavras-chave: | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
Data: | Set-2020 |
Editora: | IOP Publishing Ltd |
Revista: | 2D Materials |
Citação: | Costa, A. T., Santos, D. L. R., Peres, N. M., et. al.(2020). Topological magnons in CrI3 monolayers: an itinerant fermion description. 2D Materials, 7(4), 045031 |
Resumo(s): | Magnons dominate the magnetic response of ferromagnetic two-dimensional crystals such as CrI3. Because of the arrangement of Cr spins in a honeycomb lattice, magnons in CrI3 bear a strong resemblance with electrons in graphene. Neutron scattering experiments carried out in bulk CrI3 show the existence of a gap at the Dirac points, conjectured to have a topological nature. We propose a theory for magnons in CrI3 monolayers based on an itinerant fermion picture, with a Hamiltonian derived from first principles. We obtain the magnon dispersion for 2D CrI3 with a gap at the Dirac points with the same Berry curvature in both valleys. For CrI3 ribbons, we find chiral in-gap edge states. Analysis of the magnon wave functions in momentum space confirms their topological nature. Importantly, our approach does not require a spin Hamiltonian, and can be applied to insulating and conducting 2D materials with any type of magnetic order. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/68513 |
DOI: | 10.1088/2053-1583/aba88f |
ISSN: | 2053-1583 |
e-ISSN: | 2053-1583 |
Versão da editora: | https://iopscience.iop.org/article/10.1088/2053-1583/aba88f/meta |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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2002.00077.pdf | 558,87 kB | Adobe PDF | Ver/Abrir |