Adsorbed or intercalated: Na on graphene/Ir(111)

Pervan, Petar; Lazić, Predrag

doi:10.1103/physrevmaterials.1.044202

Cited by 19 publications

(21 citation statements)

References 63 publications

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“…[15] have already reported a shift of the Dirac Point to around 1.2-1.3 eV below the Fermi level when Na is intercalated on a Gr/Ir(111) sample, indicating an efficient mechanism of charge transfer from the alkali metal to the graphene. The controversy about whether sodium intercalates or not underneath graphene at RT [15], [19] [30] does not apply in our scenario, since we evaporate NaCl, and dissociate it with photons. A n-doping have already been reported by Papagno et al [19] and Jeon et al .…”

Section: Resultsmentioning

confidence: 99%

“…Regardless of the final goal, the different intercalation processes themselves merit comprehensive studies. Among the different works found in literature, the intercalation and adsorption of alkali metals such as potassium [12], lithium [13], cesium [14] or sodium [15][16][17] have been proven to be very appealing to engineer the band structure of graphene. In the case of sodium there is still controversy on whether it intercalates or adsorbs on top of graphene [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Reversible graphene decoupling by NaCl photo-dissociation

et al. 2019

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We describe the reversible intercalation of Na under graphene on Ir(111) by photo-dissociation of a previously adsorbed NaCl overlayer. After room temperature evaporation, NaCl adsorbs on top of graphene forming a bilayer. With a combination of electron diffraction and photoemission techniques we demonstrate that the NaCl overlayer dissociates upon a short exposure to an X-ray beam. As a result, chlorine desorbs while sodium intercalates under the graphene, inducing an electronic decoupling from the underlying metal. Low energy electron diffraction shows the disappearance of the moiré pattern when Na intercalates between graphene and iridium. Analysis of the Na 2p core-level by X-ray photoelectron spectroscopy shows a chemical change from NaCl to metallic buried Na at the graphene/Ir interface. The intercalation-decoupling process leads to a n-doped graphene due to the charge transfer from the Na, as revealed by constant energy angle resolved X-ray photoemission maps. Moreover, the process is reversible by a mild annealing of the samples without damaging the graphene.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reversible graphene decoupling by NaCl photo-dissociation

et al. 2019

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“…8,[11][12][13][14][15][16][17][18][19][20] Alkaline or alkaline earth intercalated graphene has also recently been extensively studied theoretically and experimentally. [21][22][23][24][25][26][27][28][29][30][31] This kind of graphene intercalates supports two 2D plasmons; Dirac and acoustic plasmons, which are a consequence of hybridization between the two 2D plasmas lying in graphene and metallic planes. 32 The metallic layer provides strong natural doping of graphene layers resulting in very strong Dirac plasmon.…”

Section: Introductionmentioning

confidence: 99%

Strong two-dimensional plasmon in Li-intercalated hexagonal boron-nitride film with low damping

et al. 2018

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The field of plasmonics seeks to find materials with an intensive plasmon (large plasmon pole weight) with low Landau, phonon, and other losses (small decay width). In this paper, we propose a new class of materials that show exceptionally good plasmonic properties. These materials consist of van der Waals stacked "plasmon active" layers (atomically thin metallic layers) and "supporting" layers (atomically thin wide band gap insulating layers). One such material that can be experimentally realizedlithium intercalated hexagonal boron-nitride is studied in detail. We show that its 2D plasmon intensity is superior to the intensity of well-studied Dirac plasmon in heavy doped graphene, which is hard to achieve. We also propose a method for computationally very cheap, but accurate analysis of plasmon spectra in such materials, based on one band tight-binding approach and effective background dielectric function.

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“…Second, the graphene-substrate interaction is relatively weak such that the graphene π-band is almost intact 7,8 . Actually, the electronic structure, which presents mini gaps and replica bands, can be tuned and chemically decoupled from the substrate by intercalation [9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Selecting "Convenient Observers" to Probe the Atomic Structure of Epitaxial Graphene Grown on Ir(111) via Photoelectron Diffraction

Barreto,

de Lima,

Martins

et al. 2020

Preprint

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Epitaxial graphene grown on metallic substrates presents, in several cases, a long-range periodic structure due to a lattice mismatch between the graphene and the substrate. For instance, graphene grown on Ir(111), displays a corrugated supercell with distinct adsorption sites due to a variation of its local electronic structure. This type of surface reconstruction represents a challenging problem for a detailed atomic surface structure determination for experimental and theoretical techniques. In this work, we revisited the surface structure determination of graphene on Ir(111) by using the unique advantage of surface and chemical selectivity of synchrotron-based photoelectron diffraction. We take advantage of the Ir 4f photoemission surface state and use its diffraction signal as a probe to investigate the atomic arrangement of the graphene topping layer. We determine the average height and the overall corrugation of the graphene layer, which are respectively equal to 3.40 ± 0.11 Å and 0.45 ± 0.03 Å. Furthermore, we explore the graphene topography in the vicinity of its high-symmetry adsorption sites and show that the experimental data can be described by three reduced systems simplifying the Moiré supercell multiple scattering analysis.

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Adsorbed or intercalated: Na on graphene/Ir(111)

Cited by 19 publications

References 63 publications

Reversible graphene decoupling by NaCl photo-dissociation

Reversible graphene decoupling by NaCl photo-dissociation

Strong two-dimensional plasmon in Li-intercalated hexagonal boron-nitride film with low damping

Selecting "Convenient Observers" to Probe the Atomic Structure of Epitaxial Graphene Grown on Ir(111) via Photoelectron Diffraction

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