Impurity-induced triple point fermions in twisted bilayer graphene

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorRamires, Aline-
Autor(es): dc.creatorLado, Jose L.-
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Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionFundação para o Desenvolvimento da UNESP (FUNDUNESP)-
Descrição: dc.descriptionETH Fellowship program-
Descrição: dc.descriptionJSPS Core-to-Core program Oxide Superspin international network-
Descrição: dc.descriptionProcesso FAPESP: 2018/04955-9-
Descrição: dc.descriptionFUNDUNESP: 2338-2014 CCP-
Descrição: dc.descriptionProcesso FAPESP: 2018/18287-8-
Descrição: dc.descriptionTriple point fermions are elusive electronic excitations that generalize Dirac and Weyl modes beyond the conventional high-energy paradigm. Yet, finding real materials naturally hosting these excitations at the Fermi energy has remained challenging. Here we show that twisted bilayer graphene is a versatile platform to realize robust triple point fermions in two dimensions. In particular, we establish that the introduction of localized impurities lifts one of the two degenerate Dirac cones, yielding triple point fermions at charge neutrality. Furthermore, we show that the valley polarization is preserved for certain impurity locations in the Moire supercell for both weak and strong impurity potentials. We finally show that in the presence of interactions, a symmetry-broken state with local magnetization can develop out of the triple point bands, which can be selectively controlled by electrostatic gating. Our results put forward twisted bilayer graphene as a simple solid-state platform to realize triple point fermions at charge neutrality and demonstrate the nontrivial role of impurities in Moire systems.-
Formato: dc.format7-
Idioma: dc.languageen-
Publicador: dc.publisherAmer Physical Soc-
Relação: dc.relationPhysical Review B-
Direitos: dc.rightsopenAccess-
Título: dc.titleImpurity-induced triple point fermions in twisted bilayer graphene-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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