Potential energy landscape of metallic Moiré patterns

Bork, Jakob; Wahl, Peter; Diekhöner, Lars; Kern, Klaus

doi:10.1088/1367-2630/11/11/113051

Cited by 11 publications

(10 citation statements)

References 32 publications

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“…In addition to the interesting physical properties resulting from their own two-dimensional characters, their physical properties can be tuned through the lattice distortion due to the interaction with the lattice-mismatched substrate. In particular, the lateral superlattice formed by the interface lattice mismatch often modulates the electronic states periodically [3].…”

Section: Introductionmentioning

confidence: 99%

Electronic and magnetic properties of the Fe₂N monolayer film tuned by substrate symmetry

Hattori

Miyamachi

Yokoyama

et al. 2019

J. Phys.: Condens. Matter

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The robust bonding between Fe and N atoms has the potential to fabricate a ferromagnetic Fe 2 N monolayer of a square lattice independently of the symmetry of the substrate. The electronic and magnetic properties tuned by the symmetry of the substrates are investigated by comparing the results of scanning tunnel microscopy and x-ray absorption spectroscopy/ magnetic circular dichroism of the square Fe 2 N monolayer on the Cu(1 1 1) substrate with that on the Cu(0 0 1) substrate. A periodic electronic modulation of the Fe 2 N monolayer on the Cu(1 1 1) substrate is induced by the stripe superlattice due to the difference of the lattice symmetry between the Fe 2 N monolayer and the Cu(1 1 1) substrate. The electronic and magnetic properties of the monolayer are largely affected by the hybridization with the Cu substrate and the Fe magnetic moment is much reduced compared to the monolayer on the Cu(0 0 1) substrate.

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Section: Introductionmentioning

confidence: 99%

Electronic and magnetic properties of the Fe₂N monolayer film tuned by substrate symmetry

Hattori

Miyamachi

Yokoyama

et al. 2019

J. Phys.: Condens. Matter

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“…[21][22][23][24] These kind of weak reconstructions and Moire ´patterned surface systems have been seen for many materials. [25][26][27][28][29][30] We will compare the self-assembly of TMA on this modulated surface with the flat surfaces of Ag(111) and Cu (111). Changing the balance between molecule-molecule and molecule-surface interaction is shown to have a drastic effect on the self-assembly: we will demonstrate that the molecular self-assembly of TMA at room temperature is strongly disturbed due to the modulated substrate as long as TMA is interacting via fairly weak hydrogen bonding, whereas annealing allows a stronger intermolecular interaction via ionic hydrogen bonds that leads to a new well-ordered phase with shape and symmetry steered by the substrate.…”

Section: Introductionmentioning

confidence: 99%

Molecular self-assembly at nanometer scale modulated surfaces: trimesic acid on Ag(111), Cu(111) and Ag/Cu(111)

Baviloliaei

Diekhöner

2014

Phys. Chem. Chem. Phys.

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The balance between molecule-molecule and molecule-surface interactions is a determining factor in the creation of well-ordered organic networks formed by self-assembly on crystalline metal surfaces. We have used a scanning tunneling microscope under ultrahigh vacuum conditions to study the molecular self-assembly of trimesic acid on a surface that is modulated on a comparable nanometer scale as the size of the molecules. This is made of one layer of silver grown on a Cu(111) surface where it forms a periodic reconstruction. It is shown that the self-assembly of trimesic acid at room temperature, where intermolecular interactions are taking place via hydrogen bonds, is strongly disturbed due to the modulated substrate and the spatially varying potential imposed on the molecules. Annealing to 350 K partly deprotonates the molecules and changes the intermolecular interactions to stronger ionic hydrogen bonds. This reduces the influence of the modulated substrate and allows the molecules to self-assemble into long-range ordered networks on the surface. Comparisons are made to self-assembly on the flat surfaces of Ag(111) and Cu(111), where we always find well-ordered molecular networks.

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“…The importance of these dynamical processes extends, for example, to metal oxidation rates 1,2 and functionality ͑catalytic, magnetic, etc.͒ of supported heterogeneous materials when surface/volume ratio and/or a complex structural pattern formation become important. 3,4 A good deal of work has thus been dedicated to explaining the motion of adatom clusters on surfaces in homoepitaxial metallic systems [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and, more recently, in heteroepitaxial systems. 15,[22][23][24][25] Heteroepitaxy of course exhibits a broad variety of growth modes and diffusion processes but, at the same time, introduces factors beyond those that need be considered in homoepitaxial models in order to comprehend the diffusivity of adatom clusters.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of the Cu monomer and dimer on Ag(111): Molecular dynamics simulations and density functional theory calculations

et al. 2010

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We present results of molecular dynamics ͑MD͒ simulations and density functional theory ͑DFT͒ calculations of the diffusion of Cu adatom and dimer on Ag͑111͒. We have used potentials generated by the embedded-atom method for the MD simulations and pseudopotentials derived from the projected-augmentedwave method for the DFT calculations. The MD simulations ͑at three different temperatures: 300, 500, and 700 K͒ show that the diffusivity has an Arrhenius behavior. The effective energy barriers obtained from the Arrhenius plots are in excellent agreement with those extracted from scanning tunneling microscopy experiments. While the diffusion barrier for Cu monomers on Ag͑111͒ is higher than that reported ͑both in experiment and theory͒ for Cu͑111͒, the reverse holds for dimers ͓which, for Cu͑111͒, has so far only been theoretically assessed͔. In comparing our MD result with those for Cu islets on Cu͑111͒, we conclude that the higher barriers for Cu monomers on Ag͑111͒ results from the comparatively large Ag-Ag bond length, whereas for Cu dimers on Ag͑111͒ the diffusivity is taken over and boosted by the competition in optimization of the Cu-Cu dimer bond and the five nearest-neighbor Cu-Ag bonds. Our DFT calculations confirm the relatively large barriers for the Cu monomer on Ag͑111͒-69 and 75 meV-compared to those on Cu͑111͒ and hint a rationale for them. In the case of the Cu dimer, the relatively long Ag-Ag bond length makes available a diffusion route whose highest relevant energy barrier is only 72 meV and which is not favorable on Cu͑111͒. This process, together with another involving an energy barrier of 83 meV, establishes the possibility of low-barrier intercell diffusion by purely zigzag mechanisms.

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Potential energy landscape of metallic Moiré patterns

Cited by 11 publications

References 32 publications

Electronic and magnetic properties of the Fe₂N monolayer film tuned by substrate symmetry

Electronic and magnetic properties of the Fe₂N monolayer film tuned by substrate symmetry

Molecular self-assembly at nanometer scale modulated surfaces: trimesic acid on Ag(111), Cu(111) and Ag/Cu(111)

Diffusion of the Cu monomer and dimer on Ag(111): Molecular dynamics simulations and density functional theory calculations

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Potential energy landscape of metallic Moiré patterns

Cited by 11 publications

References 32 publications

Electronic and magnetic properties of the Fe2N monolayer film tuned by substrate symmetry

Electronic and magnetic properties of the Fe2N monolayer film tuned by substrate symmetry

Molecular self-assembly at nanometer scale modulated surfaces: trimesic acid on Ag(111), Cu(111) and Ag/Cu(111)

Diffusion of the Cu monomer and dimer on Ag(111): Molecular dynamics simulations and density functional theory calculations

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Electronic and magnetic properties of the Fe₂N monolayer film tuned by substrate symmetry

Electronic and magnetic properties of the Fe₂N monolayer film tuned by substrate symmetry