Electronic and magnetic properties of graphene quantum dots with two charged vacancies

Kul, E. Bulut; Polat, Mustafa; Güçlü, A. D.

doi:10.48550/arxiv.2006.11048

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…In Ref. [31] the electric and the magnetic properties of a bivacancy structure were studied using a one-band mean-field Hubbard model, where it was shown that the magnetization of the vacancies is strongly suppressed in frustrated and molecular collapse regimes, which proves that our spin-degenerate model is sufficient.…”

Section: Modelmentioning

confidence: 96%

Molecular collapse in graphene: Sublattice symmetry effect

et al. 2020

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Atomic collapse can be observed in graphene because of its large "effective" fine structure constant, which enables this phenomenon to occur for an impurity charge as low as Z c ∼ 1-2. Here we investigate the effect of the sublattice symmetry on molecular collapse in two spatially separated charge tunable vacancies, which are located on the same (A-A type) or different (A-B type) sublattices. We find that the broken sublattice symmetry: (1) does not affect the location of the main bonding and antibonding molecular collapse peaks, (2) but shifts the position of the satellite peaks, because they are a consequence of the breaking of the local sublattice symmetry, and (3) there are vacancy characteristic collapse peaks that only occur for A-B type vacancies, which can be employed to distinguish them experimentally from the A-A type. As the charge, energy, and separation distance increase, the additional collapse features merge with the main molecular collapse peaks. We show that the spatial distribution around the vacancy site of the collapse states allows us to differentiate the molecular from the frustrated collapse.

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Section: Modelmentioning

confidence: 96%

Molecular collapse in graphene: Sublattice symmetry effect

et al. 2020

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“…When point defects are randomly distributed, vacancyinduced states appear in the energy spectrum [35]. Since these defect states are localized around the FL [ 14,32,35,36], they will follow the FL when β is turned on [8]. Consequently, the existence of the localized states does not affect the discussion about the DP, and which is again at the energy origin in the presence of the Coulomb impurity.…”

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confidence: 99%

Atomic Collapse in Disordered Graphene Quantum Dots

Polat,

Güçlü

2020

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Electronic and magnetic properties of graphene quantum dots with two charged vacancies

Cited by 2 publications

References 46 publications

Molecular collapse in graphene: Sublattice symmetry effect

Molecular collapse in graphene: Sublattice symmetry effect

Atomic Collapse in Disordered Graphene Quantum Dots

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