Anomalous Decay of Electronically Stabilized Lead Mesas on Ni(111)

Bollmann, Tjeerd Rogier Johannes; Gastel, Raoul van; Zandvliet, Henricus J.W.; Poelsema, Bene

doi:10.1103/physrevlett.107.136103

Cited by 18 publications

(21 citation statements)

References 20 publications

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“…Analysis is shown in fig. 4 The nucleation experiments reported in this study have extended earlier work [21][22][23][24][25][26] on Pb/Si(111) with several techniques showing a very unusual type of diffusion, but none of these earlier experiments have examined the "explosive" nucleation. First non-classical fast mass transport was observed in coarsening experiments, well after nucleation, with surface X-ray scattering.…”

Section: In Addition To the Preferential Directional Growth Of Indivimentioning

confidence: 64%

Nonclassical “Explosive” Nucleation in Pb/Si(111) at Low Temperatures

et al. 2014

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Classically, the onset of nucleation is defined in terms of a critical cluster of the condensed phase, which forms from the gradual aggregation of randomly diffusing adatoms. Experiments in Pb/Si(111) at low temperature have discovered a dramatically different type of nucleation, with perfect crystalline islands emerging "explosively" out of the compressed wetting layer after a critical coverage Θ_{c}=1.22 ML is reached. The unexpectedly high island growth rates, the directional correlations in the growth of neighboring islands and the persistence in time of where mass is added in individual islands, suggest that nucleation is a result of the highly coherent motion of the wetting layer, over mesoscopic distances.

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Section: In Addition To the Preferential Directional Growth Of Indivimentioning

confidence: 64%

Nonclassical “Explosive” Nucleation in Pb/Si(111) at Low Temperatures

et al. 2014

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“…The main access road to these Friedel oscillations in a film is through calculations. Experimentally, direct access is impossible, but QSE have been observed in electron reflectivity for electrons above the vacuum level, both in integral measurements [34][35][36] and in position-resolved experiments [37][38][39][40][41] . However, because of their unique geometry, the Ir wires would offer a unique and viable opportunity to access the relationship between size selection and Friedel oscillations in a most direct manner.…”

Section: Resultsmentioning

confidence: 99%

Electronically stabilized nanowire growth

et al. 2013

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Metallic nanowires show unique physical properties owing to their one-dimensional nature. Many of these unique properties are intimately related to electron-electron interactions, which have a much more prominent role in one dimension than in two or three dimensions. Here we report the direct visualization of quantum size effects responsible for preferred lengths of self-assembled metallic iridium nanowires grown on a germanium (001) surface. The nanowire length distribution shows a strong preference for nanowire lengths that are an integer multiple of 4.8 nm. Spatially resolved scanning tunneling spectroscopic measurements reveal the presence of electron standing waves patterns in the nanowires. These standing waves are caused by conduction electrons, that is the electrons near the Fermi level, which are scattered at the ends of the nanowire.

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“…For increasing coverage the main spot intensity moves gradually from the less dense (7 × 7) domains at θ Pb/Ni ≈ 0.51 ML to the denser (4 × 4) domains at θ Pb/Ni ≈ 0.55 ML, as is reflected in the line profiles shown as insets in figure 2(a). This remarkable two-domain structure of the wetting layer was not anticipated and is found to disappear at 520-525 K, resulting in the anomalous transition of Pb mesas into hemispheres [20]. With the nearest-neighbor distance in bulk lead being 3.50 Å and the known generic tendency for tensile surface stress [21], we suggest that the (7 × 7) domains in the wetting layer involve tensile stress.…”

Section: Wetting Layer Propertiesmentioning

confidence: 73%

Quantum size effects on surfaces without a projected bandgap: Pb/Ni(111)

et al. 2011

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Abstract. We have studied the initial growth of Pb on Ni(111) using lowenergy electron microscopy (LEEM) and selective area low-energy electron diffraction (µLEED). First, a one-layer-high wetting layer develops that consists of small (7 × 7) and (4 × 4) domains. For larger coverages, Pb mesas are formed that are embedded in the wetting layer. In spite of the absence of a projected bandgap on clean Ni(111), we observe distinct quantum size effect (QSE)-driven preferred heights. These are apparent from a variety of frequently occurring island height transitions during growth, both on wide terraces and across substrate steps. Also, the average island heights that evolve during deposition at 422 and 474 K show a clear signature of QSE-driven preferred heights. These distinctly include five, seven and nine layers and thus correspond nicely to the values obtained in the key examples of QSE: Pb films on Si(111) and Ge(111). We suggest that the Pb-induced surface modification of Ni(111) shifts the Fermi level into the gap of the interface projected Ni bulk bands, thereby effectively causing decoupling of the Pb states with the bulk Ni states.

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Anomalous Decay of Electronically Stabilized Lead Mesas on Ni(111)

Cited by 18 publications

References 20 publications

Nonclassical “Explosive” Nucleation in Pb/Si(111) at Low Temperatures

Nonclassical “Explosive” Nucleation in Pb/Si(111) at Low Temperatures

Electronically stabilized nanowire growth

Quantum size effects on surfaces without a projected bandgap: Pb/Ni(111)

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