Quantum size effects in Pb islands on Cu(111): Electronic structure calculations

Ogando, E.; Zabala, Nerea; Chulkov, Eugene V.; Puska, Martti J.

doi:10.1103/physrevb.69.153410

Cited by 38 publications

(68 citation statements)

References 20 publications

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“…LWF should show similar quantum behavior with respect to local thickness change. Previous studies have shown the evidence of an oscillatory work function over film thickness, [74][75][76][77][78][79] however, experiment measurement of LWF of a nanostructure is essentially difficult since it requires high spatial resolution and high sensitivity in terms of the very local variation.…”

Section: Local Work Functionmentioning

confidence: 99%

Quantum Size Effects Induced Novel Properties in Two-Dimensional Electronic Systems: Pb Thin Films on Si(111)

Jia

Zhang

et al. 2007

J. Phys. Soc. Jpn.

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Atomically flat metal ultrathin films grown on semiconductor substrates form a quasi-two-dimensional (2D) electronic system, which offers a great opportunity to explore novel properties induced by quantum size effects (QSE). In such a system, the motion of electrons in the film plane is essentially free, however, in the film normal direction it is confined, which leads to the quantized electronic states, i.e., quantum well states (QWS). The formation of QWS induces the redistribution of electrons and changes the electronic structure of the metal films and thus modifies their properties. By controlling the film thickness-the width of the confinement potential well, the QWS, together with the physical and chemical properties of the films can be engineered. In this article, we will summarize our recent studies on this problem in the Pb/Si(111) system, and discuss the perspectives in this area.

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Section: Local Work Functionmentioning

confidence: 99%

Quantum Size Effects Induced Novel Properties in Two-Dimensional Electronic Systems: Pb Thin Films on Si(111)

Jia

Zhang

et al. 2007

J. Phys. Soc. Jpn.

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“…In practice, the jellium model allows us to simulate any Pb overlayer thickness. 13 The Pb contribution to V ps ͑z͒ stabilizing the electron gas at the density ͑n =3/4r s 3 ͒ corresponding to r s = 2.30a 0 is a constant shift V stab relative to the vacuum level restricted to the region of the positive background charge. The stabilized Pb provides a proper work function so that the spilling of the electron density into the vacuum is well described.…”

Section: A Construction Of the Pseudopotentialmentioning

confidence: 99%

“…The oscillations in energy are the origin of the "magic" islands heights. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] In a previous publication 13 we successfully applied a one-dimensional ͑1D͒ pseudopotential model to gain physical insight into the magic heights of Pb islands on Cu͑111͒, by studying the energetics of that system. In fact, the beating pattern obtained has been measured in the Pb/ Si͑111͒ system.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent study of electron confinement to metallic thin films on solid surfaces

Ogando¹,

Zabala

Chulkov

et al. 2005

Phys. Rev. B

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All material supplied via Aaltodoc is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not permitted, except that material may be duplicated by you for your research use or educational purposes in electronic or print form. You must obtain permission for any other use. Electronic or print copies may not be offered, whether for sale or otherwise to anyone who is not an authorised user.Powered by TCPDF (www.tcpdf.org)Self-consistent study of electron confinement to metallic thin films on solid surfaces We present a method for density-functional modeling of metallic overlayers grown on a support. It offers a useful tool to study nanostructures, combining the power of self-consistent pseudopotential calculations with the simplicity of a one-dimensional approach. The model is illustrated for Pb layers grown on the Cu͑111͒ surface. The analysis provides the strength of the electron confinement barriers in thin slabs with accuracy, supporting the interpretation of the quantum well state spectra measured by scanning tunneling spectroscopy. On the other hand, it offers a benchmark to check the simple analytical models commonly used in the literature to study metallic films on semiconducting or metallic surfaces. As a result, some deficiencies are detected in the applicability of those models, which often lead to an overestimation of the number of wetting layers. Finally, an improved formula is proposed.

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“…Scanning-tunneling microscopy observation of Pb nanocrystals grown on Cu(111) indicates that in the equilibrium distribution of the island heights, some heights appear much more frequently than other ones [2]. An appearance of these 'magic" island heights on the Cu flat surface was studied by self-consistent electronic structure calculations [3].…”

Section: Introductionmentioning

confidence: 99%

Energetics of metal slabs and clusters: The rectangular-box model

2005

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An expansion of energy characteristics of wide thin slab of thickness L in power of 1/L is constructed using the free-electron approximation and the model of a potential well of finite depth. Accuracy of results in each order of the expansion is analyzed. Size dependences of the work function and electronic elastic force for Au and Na slabs are calculated. It is concluded that the work function of low-dimensional metal structure is always smaller that of semi-infinite metal sample.A mechanism for the Coulomb instability of charged metal clusters, different from Rayleigh's one, is discussed. The two-component model of a metallic cluster yields the different critical sizes depending on a kind of charging particles (electrons or ions). For the cuboid clusters, the electronic spectrum quantization is taken into account. The calculated critical sizes of Ag 2− N and Au 3− N clusters are in a good agreement with experimental data. A qualitative explanation is suggested for the Coulomb explosion of positively charged Na n+ N clusters at 3≤ n ≤5.

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Quantum size effects in Pb islands on Cu(111): Electronic structure calculations

Cited by 38 publications

References 20 publications

Quantum Size Effects Induced Novel Properties in Two-Dimensional Electronic Systems: Pb Thin Films on Si(111)

Quantum Size Effects Induced Novel Properties in Two-Dimensional Electronic Systems: Pb Thin Films on Si(111)

Self-consistent study of electron confinement to metallic thin films on solid surfaces

Energetics of metal slabs and clusters: The rectangular-box model

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