Emergent quantum matter in graphene nanoribbons

Lado, José L.; Ortiz, R. A.; Fernández-Rossier, J.

doi:10.1088/978-0-7503-1701-6ch4

Cited by 4 publications

(4 citation statements)

References 86 publications

(156 reference statements)

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“…Although electronic correlations are expected to play a crucial role for the localized topological states in GNR heterostructures, so far, most theoretical work has been restricted to tight-binding (TB) models or density functional theory within the local density approximation (LDA-DFT), which are known to completely ignore or underestimate these effects. Here, we present a systematic analysis of electronic correlations in 7–9-AGNRs, based on a Green functions method with GW self-energy , applied to an effective Hubbard model.…”

mentioning

confidence: 99%

Correlated Topological States in Graphene Nanoribbon Heterostructures

2019

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Finite graphene nanoribbon (GNR) heterostructures host intriguing topological in-gap states (Rizzo, D. J. et al. Nature 2018, 560, 204]). These states may be localized either at the bulk edges, or at the ends of the structure. Here we show that correlation effects (not included in previous density functional simulations) play a key role in these systems: they result in increased magnetic moments at the ribbon edges accompanied by a significant energy renormalization of the topological end states -even in the presence of a metallic substrate. Our computed results are in excellent agreement with the experiments. Furthermore, we discover a striking, novel mechanism that causes an energy splitting of the non-zero-energy topological end states for a weakly screened system. We predict that similar effects should be observable in other GNR heterostructures as well.

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confidence: 99%

Correlated Topological States in Graphene Nanoribbon Heterostructures

2019

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“…(This is different from the well studied CrI 3 monolayer, where the Cr 3+ ion has a closed t 3 2g shell and has a negligible SIA, and the notable anisotropic exchange comes from the strong SOC of the heavy I 5p orbitals and strong Cr 3d-I 5p hybridization. 19,20 ) Note that for VBr 3 monolayer under the tensile strain, the FM J parameter is significantly enhanced, and the SIA D parameter changes from a small negative value to a large positive one, see the bare VBr 3 monolayer, its T C is about 20 K, according to our Monte Carlo simulations, due to the relatively small SIA and the relatively weak FM superexchange. In strong contrast, the VBr 3 monolayer has a significantly increasing T C up to 100-115 K under the 2.5-5% tensile strain, due to the strong FM coupling and strong SIA.…”

Section: Vbr 3 Monolayermentioning

confidence: 64%

“…1,[15][16][17][18] It is worth noting that FM CrI 3 , with a closed Cr 3+ t 3 2g shell, has a quenched orbital moment, and that its magnetic anisotropy comes from an exchange anisotropy induced by the spin-orbit coupling (SOC) of the heavy I 5p orbitals and their hybridization with Cr 3d. 19,20 In contrast, the open V 3+ t 2 2g shell in vanadium trihalides may carry an unquenched orbital moment and achieve a single ion anisotropy (SIA) via the V 3+ SOC. This seems to account for the hard perpendicular FM with T C ≈50 K observed in VI 3 bulk [16][17][18] and even the Ising FM in VI 3 monolayer.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional ferromagnetic semiconductor VBr3 with tunable anisotropy

Liu,

Yang,

Wang

et al. 2020

Preprint

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Two-dimensional (2D) ferromagnets (FMs) have attracted widespread attention due to their prospects in spintronic applications. Here we explore the electronic structure and magnetic properties of the bulk and monolayer of VBr3 in the honeycomb lattice, using first-principles calculations, crystal field level analyses, and Monte Carlo simulations. Our results show that VBr3 bulk has the e ′ g 2 (S=1) ground state and possesses a small orbital moment and weak magnetic anisotropy favoring in-plane. Those results well explain the recent experiments. More interestingly, we find that a tensile strain on the semiconducting VBr3 monolayer tunes the ground state into a1g 1 e ′ g 1 and thus produces a large orbital moment and a strong out-of-plane anisotropy. Then, the significantly enhanced FM superexchange and single ion anisotropy (SIA) would raise TC from 20 K for the bare VBr3 monolayer to 100-115 K under a 2.5%-5% strain. Therefore, VBr3 would be a promising 2D FM semiconductor with a tunable anisotropy.

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“…For example, spin-singlet p-wave MoS 2 introduces a new topological phase by broken time-reversal symmetry which is because of the spin-orbit interaction effect [14]. Recent studies reported s-wave and p-wave pairing superconducting states for graphene nanoribbons and investigated the topological states by Zak phase [15,16].…”

Section: Introductionmentioning

confidence: 99%

Induced superconductivity in linear carbon chains and engineering of zero-bias peaks with geometric angles: a new approach

Norouzi¹,

Seyed-Yazdi²

2021

Phys. Scr.

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We investigated the effect of slip angle, a geometric parameter named as α in superconducting quasi-one-dimensional carbon structures, by engendering resonant peak of linear carbon chains. We studied also the density of states and the effect of different slip angles on this structure. We found the interesting role of the slip angle, similar to the mixed superconducting state, creating a mass-like gap in the electron-hole excitation spectrum of the superconducting quasi-one-dimensional carbon structure. In the framework of the Dirac-Bogoliubov–de Gennes formalism, we investigated the transport properties in the superconducting linear carbon chain. The superconductor gap is taken to be a spin-singlet and spin-triplet superconducting state.

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Emergent quantum matter in graphene nanoribbons

Cited by 4 publications

References 86 publications

Correlated Topological States in Graphene Nanoribbon Heterostructures

Correlated Topological States in Graphene Nanoribbon Heterostructures

Two-dimensional ferromagnetic semiconductor VBr3 with tunable anisotropy

Induced superconductivity in linear carbon chains and engineering of zero-bias peaks with geometric angles: a new approach

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