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arXiv 1903.00337physics.chem-phcond-mat.mes-hallphysics.atom-ph
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work function的晶体取向依赖性:碳在Au表面的吸附

Crystallographic orientation dependence of work function: Carbon adsorption on Au surfaces

H. Z. Jooya, X. Fan, K. S. McKay, D. P. Pappas, D. A. Hite, H. R. Sadeghpour

摘要:

我们研究了碳原子吸附对不同金晶体表面取向的功函数的影响。在密度泛函理论内的从头计算在碳沉积的(100)、(110)和(111)金表面上进行。WF的行为与碳覆盖不同的表面取向的解释所得到的电子电荷密度分布。碳吸附在亚单层(ML)覆盖的动力学取决于景观的势能面。在较高的ML覆盖率下,由于吸附饱和,WF将具有弱的表面取向依赖性。这一系统的研究结果对研究多晶金离子阱电极产生的电场噪声具有重要意义,多晶金离子阱电极已被大量应用于微加工电极。

英文摘要:

We investigate the work function (WF) variation of different Au crystallographic surface orientations with carbon atom adsorption. Ab-initio calculations within density-functional theory are performed on carbon deposited (100), (110), and (111) gold surfaces. The WF behavior with carbon coverage for the different surface orientations is explained by the resultant electron charge density distributions. The dynamics of carbon adsorption at sub-to-one-monolayer (ML) coverage depends on the landscape of the potential energy surfaces. At higher ML coverage, because of adsorption saturation, the WF will have weak surface orientation dependence. This systematic study has consequential bearing on studies of electric-field noise emanating from polycrystalline gold ion-trap electrodes that have been largely employed in microfabricated electrodes.

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