Interplay between Atomic and Mesoscopic Order on Gold Vicinal Surfaces

Repain, Vincent; Berroir, Jean-Marc; Croset, B.; Rousset, Sylvie; Garreau, Y.; Etgens, V. H.; Lecoeur, J.

doi:10.1103/physrevlett.84.5367

Cited by 43 publications

(48 citation statements)

References 17 publications

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“…In Au͑322͒ terraces are 1ϫ1, ͑111͒ planes, whereas Au͑788͒ terraces display a characteristic reconstruction that is similar to the reconstruction of Au͑111͒. 9,10 This is better observed in the closer view shown in the inset of Fig. 1͑b͒ where the corrugation due to the terrace levels has been subtracted.…”

Section: Introductionmentioning

confidence: 51%

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One-dimensional versus two-dimensional surface states on steppedAu(111)

et al. 2002

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Surface states at vicinal Au͑788͒ and Au͑322͒ have been investigated with angle-resolved photoemission and synchrotron radiation. Both surfaces are characterized by highly regular one-dimensional step arrays with relatively wide ͑ϳ3.9 Å͒ or narrow ͑ϳ1.3 Å͒ terraces in Au͑788͒ and Au͑322͒, respectively. Depending on the terrace size we observe that surface electrons behave in a completely different way. In Au͑788͒ terraces become one-dimensional, lateral quantum wells that confine surface electrons between adjacent steps. In Au͑322͒ surface electrons propagate across the step array forming two-dimensional superlattice bands. By tuning photon energy and angle we probe fundamental properties of the electron wave functions in both cases.

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Section: Introductionmentioning

confidence: 51%

“…In situ surface preparation is done by extensive sputtering-annealing cycles. Most of Au͑111͒ vicinals undergo facetting, 9 but Au͑322͒ and Au͑788͒ are stable orientations. Figure 1 shows the respective scanning tunneling microscopy ͑STM͒ images.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional versus two-dimensional surface states on steppedAu(111)

et al. 2002

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“…One may invoke also the presence of the surface reconstruction stabilizing straight steps as observed on Si(111) [8]. For most of the Au(111) vicinals this reconstruction leads to a hill-and-valley, faceted structure [9], but Au(788) is a stable orientation. The LEED pattern of the specular spot taken at E 20 eV shown in Fig.…”

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confidence: 99%

“…The inset shows the detailed structure at a smaller scale. Bright and dark areas indicate the presence of alternating fccand hcp-packed layers within the same terrace [9]. (c) The LEED pattern contains both superstructures perpendicular and parallel to the terraces.…”

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Electron Confinement in Surface States on a Stepped Gold Surface Revealed by Angle-Resolved Photoemission

Mascaraque²,

et al. 2001

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STM images show that vicinal Au(788) surfaces are made up of a uniform array of (111)-oriented terraces of similar width ͑ϳ3.8 nm͒. This uniformity makes it possible to study the electronic structure of the resulting step superlattice by angle-resolved photoemission. We show that for this terrace array the surface state appears to be broken up into one-dimensional quantum-well levels, indicating total electron confinement within the terraces. The angular resolution allows the probability density of the terrace quantum well state to be mapped in reciprocal space, complementing nicely the wave function measured in real space by STM. DOI: 10.1103/PhysRevLett.87.107601 PACS numbers: 79.60.Bm, 68.35.Bs, 73.21. -b Vicinal surfaces are natural templates for growing nanostructured solids with low-dimensional properties [1,2]. They also serve as model systems for studying the electron wave functions and other basic properties of lateral nanostructures [3]. Vicinal noble metal (111) surfaces are particularly suitable because they have a freeelectron-like surface state that scatters strongly at step edges, leading to one-dimensional confinement within terraces, standing-wave patterns, and step superlattice effects [4 -6]. One big advantage is that the surface state can be readily probed by both scanning tunneling microscopy/ spectroscopy (STM/STS) or photoemission [3][4][5][6][7]. Since photoemission is an averaging technique it requires regular arrays of steps over comparatively large areas to obtain meaningful results. However, most surfaces have a variety of defects and in general a broad distribution of terrace sizes. This hampers the observation of small effects such as the opening of a step superlattice gap at the edge of the Brillouin zone. In contrast, in STM a single terrace is enough to study electronic properties, such as confinement or scattering, but the reciprocal space of the superlattice cannot be properly investigated as in photoemission. It is interesting to note the difference between STM experiments that reveal total electron confinement [4,5], and photoemission results that show electron dispersion across the steps and superlattice effects [3,6,7]. Although the differences appear to be related to the average terrace size involved (large in STM, small in photoemission, [3]), in fact terrace confinement of surface states observed with photoemission has never been reported previously. Here we present clear evidence of the first two energy levels of a terrace quantum well from photoemission in agreement with STM observations. Both levels display strong angular-dependent intensity, as expected from the photoemission matrix element of one-dimensional quantum-well levels. We show how angular scans of the photoemission intensity probe in reciprocal space the same localized electron wave functions probed by STM in real space.Photoemission experiments have been performed at the SU8 undulator, Spanish-French beam line at LURE (Paris). The experiments were performed at 300 K using p-polarized light and photon ...

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“…1(c). It has been reported earlier for Au(111) that the discommensurate lines become parallel to the step edges with {100} microfacets [13][14][15]. This indicates that the step edges of the Cr islands that are parallel to the discommensurate lines comprise of {100} microfacets.…”

Section: Resultsmentioning

confidence: 74%

Chromium Nano-Islands on Au(111)

Rai

JNayak

Barman

2014

e-J. Surf. Sci. Nanotech.

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Ordered chromium islands of nanometer sizes formed by sub-monolayer Cr deposition on Au(111) have been studied in this work by scanning tunneling microscopy under ultra high vacuum. Bimodal size distribution of the islands are observed in 0.25-0.45 monolayer (ML) coverage: the bigger islands are formed at the elbows of the herringbone reconstruction, while relatively smaller sized Cr islands appear due to the distortion of the herringbone pattern by the islands formed at the bulged elbows. Further deposition results in increase of the island size with characteristic shapes. Eventually, the islands coalesce resulting in pseudomorphic growth of Cr layers showing (1×1) hexagonal low energy electron diffraction pattern similar to the substrate indicating that Cr grows pseudomorphically on Au(111).

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Interplay between Atomic and Mesoscopic Order on Gold Vicinal Surfaces

Cited by 43 publications

References 17 publications

One-dimensional versus two-dimensional surface states on steppedAu(111)

One-dimensional versus two-dimensional surface states on steppedAu(111)

Electron Confinement in Surface States on a Stepped Gold Surface Revealed by Angle-Resolved Photoemission

Chromium Nano-Islands on Au(111)

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