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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Transport signatures of Kondo physics and quantum criticality in graphene with magnetic impurities

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Autor(es):
Ruiz-Tijerina, David A. ; da Silva, Luis G. G. V. Dias
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 95, n. 11 MAR 6 2017.
Citações Web of Science: 6
Resumo

Localized magnetic moments have been predicted to develop in graphene samples with vacancies or adsorbates. The interplay between such magnetic impurities and graphene's Dirac quasiparticles leads to remarkable many-body phenomena, which have, so far, proved elusive to experimental efforts. In this article we study the thermodynamic, spectral, and transport signatures of quantum criticality and Kondo physics of a dilute ensemble of atomic impurities in graphene. We consider vacancies and adatoms that either break or preserve graphene's C-3v and inversion symmetries. In a neutral graphene sample, all cases display symmetry-dependent quantum criticality, leading to enhanced impurity scattering for asymmetric impurities, in a manner analogous to bound-state formation by nonmagnetic resonant scatterers. Kondo correlations emerge only in the presence of a back gate, with estimated Kondo temperatures well within the experimentally accessible domain for all impurity types. For symmetry-breaking impurities at charge neutrality, quantum criticality is signaled by T-2 resistivity scaling, leading to full insulating behavior at low temperatures, while low-temperature resistivity plateaus appear both in the noncritical and Kondo regimes. By contrast, the resistivity contribution from symmetric vacancies and hollow-site adsorbates vanishes at charge neutrality and for arbitrary back-gate voltages, respectively. This implies that local probing methods are required for the detection of both Kondo and quantum critical signatures in these symmetry-preserving cases. (AU)

Processo FAPESP: 16/18495-4 - Transporte eletrônico e efeitos de correlação em materiais topológicos
Beneficiário:Luis Gregório Godoy de Vasconcellos Dias da Silva
Linha de fomento: Auxílio à Pesquisa - Regular