One-dimensional Ag-Cu superlattices on vicinal Cu(111)

Bachmann, A. R.; Mugarza, Aitor; Ortega, J. E.; Speller, S.

doi:10.1103/physrevb.64.153409

Cited by 18 publications

(29 citation statements)

References 10 publications

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“…This may be explained by the tendency to develop facets under deposition of adsorbates like silver atoms. 45 Furthermore, the same conclusions with respect to the stability of the vicinal surfaces are obtained also using the EPP surface energies. Thus our results suggest that the combination of high quality first-principles calculations for lowMiller-index surfaces and the EPP model can provide a better understanding of the stability of vicinal surfaces.…”

Section: Fig 2 ͑Color Online͒ ͑A͒supporting

confidence: 63%

All-electron first-principles investigations of the energetics of vicinal Cu surfaces

et al. 2006

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Using first-principles calculations we studied the energetics ͑surface energy, step energy, stability with respect to faceting͒ of the low-and high-Miller-index ͑vicinal͒ Cu surfaces, namely, the ͑111͒, ͑100͒, ͑110͒, ͑311͒, ͑331͒, ͑210͒, ͑211͒, ͑511͒, ͑221͒, ͑711͒, ͑320͒, ͑553͒, ͑410͒, ͑911͒, and ͑332͒ surfaces. Our calculations are based on density-functional theory employing the all-electron full-potential linearized augmented planewave ͑FLAPW͒ method. We found that the unrelaxed vicinal Cu surfaces between ͑100͒ and ͑111͒ are unstable relative to faceting at 0 K, while fully relaxed vicinal surfaces between ͑100͒ and ͑111͒ are stable relative to faceting, which is in agreement with the observed stability of vicinal Cu surfaces at room temperature. Thus atomic relaxations play an important role in the stability of the vicinal Cu surfaces. Using the surface energies of Cu͑111͒, Cu͑100͒, and Cu͑110͒ and employing the effective pair-potential model, which takes into account only the changes in the coordination of the surface atoms, the surface energies of the vicinal Cu surfaces can be calculated with errors smaller than 1.0% compared with the calculated FLAPW surface energies. This result is due to the almost perfect linear scaling of the surface energies of the Cu͑hkl͒ surfaces as a function of the total number of broken nearest-neighbor bonds. Furthermore, we calculate step-step interactions as a function of terrace widths and step energies of isolated steps.

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Section: Fig 2 ͑Color Online͒ ͑A͒supporting

confidence: 63%

All-electron first-principles investigations of the energetics of vicinal Cu surfaces

et al. 2006

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“…The characteristic low-energy electron diffraction (LEED) pattern with sharp split spots of Cu stripes allows us to determine the Ag coverage (±0.05 ML) and the average terrace width d within Cu nanostripes [21,22]. Previous STM and LEED studies show that annealing up to 700 K does not significantly influence the final stripe formation.…”

Section: Methodsmentioning

confidence: 99%

“…Previous STM and LEED studies show that annealing up to 700 K does not significantly influence the final stripe formation. This suggests that thermal equilibrium is reached and Cu-Ag alloying is not relevant [12,21,26].…”

Section: Methodsmentioning

confidence: 99%

“…In this study, our tunable, striped system is created by deposition of submonolayer amounts of Ag on a vicinal Cu(111) surface [12,21,22]. The resulting system is characterized by alternating self-assembled nanostripes of Ag and Cu, both aligned along the step directions of the substrate (see figure 1), but with different crystal orientations.…”

Section: Introductionmentioning

confidence: 99%

“…The resulting system is characterized by alternating self-assembled nanostripes of Ag and Cu, both aligned along the step directions of the substrate (see figure 1), but with different crystal orientations. In fact, submonolayer deposition leads to Ag-covered step bunches, such that clean Cu facets are progressively depleted of steps, until Ag-free Cu areas become (111)-oriented stripes [12,21]. Consequently, the Ag coverage has a direct influence on both the Ag and Cu stripe widths and on the local angle of the clean Cu facet (see figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Determination of the photoelectron reference plane in nanostructured surfaces

et al. 2011

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View the article online for updates and enhancements. and Enrique G Michel Abstract. In angle-resolved photoemission (ARPES) from crystalline solids, wave-vector conservation applies to the two-dimensional (2D) surface, which may thus be defined as the reference plane in ARPES. We investigate whether such reference varies for photoemitted electrons in nanometer-sized systems that expose different crystal planes. To this aim, we exploit the structural tunability of the Ag/Cu(223) system which is capable of offering surfaces with periodic arrays of nanofacets of varying size and orientation. A thorough, photonenergy-dependent analysis of the surface states confined to such nanostructures is performed comparing different reference planes for photoemitted electrons. Assuming the premise that k || must be a good quantum number for 2D states, we conclude that the (final state) photoelectron reference direction is not the average optical direction but the local facet that confines the (initial state) surface 7 Author to whom any correspondence should be addressed. electrons. Moreover, in the general case of nanostructured systems with uneven surfaces, we show how the photoelectron reference plane can be empirically determined through such a photon-energy-dependent ARPES analysis. Contents

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