Key role of rotated domains in oxygen intercalation at graphene on Ni(1 1 1)

Bignardi, Luca; Lacovig, Paolo; Dalmiglio, Matteo; Orlando, Fabrizio; Ghafari, A.; Petaccia, L.; Baraldi, Alessandro; Larciprete, R.; Lizzit, Silvano

doi:10.1088/2053-1583/aa702c

Cited by 28 publications

(31 citation statements)

References 66 publications

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“…Due to the lattice match of graphene and Ni(111) (the difference is approximately 1%), LEED and STM of the gr/Ni(111) system demonstrate (1 × 1) in-plane periodicities indicating also the high quality of this system on the large and the atomic scale. The number of defects in the graphene layer for this system is very small; however, some areas associated with the presence of the Ni 2 C phase (small scale STM images of this area are not shown here) can be detected on the surface; this is also supported by the XPS data and consistent with the previously published results for the same system [30][31][32]. The LEED and STM images of the system obtained after intercalation of Mn in gr/Ni(111) demonstrate (2 × 2) periodicities with respect to the ones of the parent system ( Fig.…”

Section: Resultssupporting

confidence: 92%

Electronic Structure and Magnetic Properties of Graphene/Ni₃Mn/Ni(111) Trilayer

et al. 2019

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Experimental and theoretical studies of manganese deposition on graphene/Ni(111) shows that a thin ferromagnetic Ni 3 Mn layer, which is protected by the graphene overlayer, is formed upon Mn intercalation. The electronic bands of graphene are affected by Ni 3 Mn interlayer formation through a slight reduction of n-type doping compared to graphene/Ni(111) and a suppression of the interface states characteristic of graphene/Ni(111). Our DFT-based theoretical analysis of interface geometric, electronic, and magnetic structure gives strong support to our interpretation of the experimental scanning tunneling microscopy, low energy electron diffraction, and photoemission results, and shows that the magnetic properties of graphene on Ni(111) are strongly influenced by Ni 3 Mn formation.This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in J. Phys.

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Section: Resultssupporting

confidence: 92%

Electronic Structure and Magnetic Properties of Graphene/Ni₃Mn/Ni(111) Trilayer

et al. 2019

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“…[ 35 ] In such a way, initial states depend mainly on the valence charge of the atom (i.e., the transferred charge from the chemical environment that constitute the so called doping for graphene) and the Madelung energy. There are some reports [ 36,37 ] that interpreted the C 1s shift of graphene only in terms of these initial states, in particular from the variation of the doping. However, it constitutes an oversimplified explanation.…”

Section: Resultsmentioning

confidence: 99%

“…According to that, we assign the new component appearing at 284.6 eV in C 1s XPS spectrum to sp 2 states of decoupled graphene from copper due to the presence of a Cu 2 O layer. This assignment is a little bit risky as, according to the literature, the decoupling of the graphene monolayer previously coupled on other metals like Ni, [ 36–38 ] Pt, Ir, Rh, [ 39 ] produces a shift of the C1s XPS peak toward lower binding energies. The interpretation of this shift was done in terms of charge transfer, that is, the decoupling of the graphene layer avoids charge transfer from metal to graphene, thus varying the initial state of the C 1s XPS peak by moving to lower binding energies.…”

Section: Resultsmentioning

confidence: 99%

Electronic Decoupling of Graphene from Copper Induced by Deposition of ZnO: A Complex Substrate/Graphene/Deposit/Environment Interaction

Morales

Urbanos

Campo

et al. 2020

Adv Materials Inter

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has been a turning point in the study and application of 2D materials. In this sense, the very high ballistic transport distances of the order of the micron and very large carrier mobility [2][3][4] combined with the absorption of 2.3% of visible light, [5] places graphene as an extraordinary candidate for new optoelectronic devices. On the other hand, graphene's impermeability to most gases [6] makes it also a promising candidate for ultrathin passivation coating. [7] However, this idealistic view contrasts with the reduced number of real applications to industry and/or produced mass electronic devices. Without doubt, this frustrating fact is related to the difficulty to grow large areas of non-defective graphene, but also with the complexity of the interaction of graphene with other materials (substrates, multilayer systems) and/or media (gas, liquids) in contact with it, which leads to changes of the graphene properties.Focusing on this last point, the substrate plays a very important role in the electronic properties of graphene due to the strength of the bonding between both. As Weatherup et al. summarized, [7] depending on the position of the d valence band states with respect to the Fermi level, [8] two different interactions are reported for metallic substrates. In the case of Ni, Co, Fe, or Pd, the strong hybridization between π graphene states and metal d states leads to the destruction of the linear dispersion of graphene at the K point. For weak interactions, such as Cu, Au, Ag, and Pt, this linear dispersion is preserved but charge transfer between metal and graphene normally shifts the Fermi level position, leading to doping of graphene. Moreover, for SiC (0001) a covalent bonding between the substrate and the first carbon layer also prevents good electrical properties of graphene. [9,10] In all these cases, this interaction can be modulated or suppressed by controlled intercalation of metallic atoms at high temperatures, [11,12] or even at room temperature for alkaline elements. [13,14] The formation of an oxidized layer between substrate and graphene [15,16] can also decouple graphene from substrates.Nevertheless, the last description offers again a simplified view of the problem. The majority of the experimental and This study presents experimental data of the interactions and reactions that occur during the early stages of the growth of ZnO on graphene supported on polycrystalline copper and the subsequent changes on the electronic properties of the graphene. The combination of substrate, graphene, and intercalated species (such as oxygen and water molecules) between graphene and copper due to air exposure, together to the evaporation of metallic zinc under oxygen atmosphere, induces the electronic decoupling of the graphene from copper by the formation of a nanometric layer of copper oxide. In particular, the final stage consists in the formation of a complex interface formed by ZnO/ZnO 1−x /Zn/G/Cu 2 O/Cu. The role of each actor is discussed in terms of a galvanic corrosion reaction of the met...

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“…58 Second: When O2 intercalates between a 2D material and their substrate, the 2D material decouples from the substrate and behaves more "free standing". [213][214][215][216][217][218][219] Third: Lithium forms itself into a superdense crystal when intercalated between bilayer graphene, disrupting the tBLG properties. 64 Optical image of a laser-written pattern on a Bi2Se3/MoS2 2D heterostructure.…”

Section: Controlled Intercalationmentioning

confidence: 99%

Twistronics: a turning point in 2D quantum materials

Hennighausen¹,

Kar²

2021

Electron. Struct.

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Moiré superlattices—periodic orbital overlaps and lattice-reconstruction between sites of high atomic registry in vertically-stacked 2D layered materials—are quantum-active interfaces where non-trivial quantum phases on novel phenomena can emerge from geometric arrangements of 2D materials, which are not intrinsic to the parent materials. Unexpected distortions in band-structure and topology lead to long-range correlations, charge-ordering, and several other fascinating quantum phenomena hidden within the physical space between the (similar or dissimilar) parent materials. Stacking, twisting, gate-modulating, and optically-exciting these superlattices open up a new field for seamlessly exploring physics from the weak to strong correlations limit within a many-body and topological framework. It is impossible to capture it all, and the aim of this review is to highlight some of the important recent developments in synthesis, experiments, and potential applications of these materials.

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Key role of rotated domains in oxygen intercalation at graphene on Ni(1 1 1)

Cited by 28 publications

References 66 publications

Electronic Structure and Magnetic Properties of Graphene/Ni₃Mn/Ni(111) Trilayer

Electronic Structure and Magnetic Properties of Graphene/Ni₃Mn/Ni(111) Trilayer

Electronic Decoupling of Graphene from Copper Induced by Deposition of ZnO: A Complex Substrate/Graphene/Deposit/Environment Interaction

Twistronics: a turning point in 2D quantum materials

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Key role of rotated domains in oxygen intercalation at graphene on Ni(1 1 1)

Cited by 28 publications

References 66 publications

Electronic Structure and Magnetic Properties of Graphene/Ni3Mn/Ni(111) Trilayer

Electronic Structure and Magnetic Properties of Graphene/Ni3Mn/Ni(111) Trilayer

Electronic Decoupling of Graphene from Copper Induced by Deposition of ZnO: A Complex Substrate/Graphene/Deposit/Environment Interaction

Twistronics: a turning point in 2D quantum materials

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Electronic Structure and Magnetic Properties of Graphene/Ni₃Mn/Ni(111) Trilayer

Electronic Structure and Magnetic Properties of Graphene/Ni₃Mn/Ni(111) Trilayer