Metal-to-Insulator Transition in Au Chains on Si(111)-5脳2-Au by Band Filling: Infrared Plasmonic Signal and Ab Initio Band Structure Calculation

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• 作者：Fabian H枚tzel ; Kaori Seino ; Sandhya Chandola ; Eugen Speiser ; Norbert Esser ; Friedhelm Bechstedt ; Annemarie Pucci
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：September 17, 2015
• 年：2015
• 卷：6
• 期：18
• 页码：3615-3620
• 全文大小：316K
• ISSN：1948-7185

文摘

The Si(111)-5脳2-Au surface is increasingly of interest because it is one of the rare atomic chain systems with quasi-one-dimensional properties. For the deposition of 0.7 monolayers of Au, these chains are metallic. Upon the evaporation of an additional submonolayer amount of gold, the surface becomes insulating but keeps the 5脳2 symmetry. This metal-to-insulator transition was in situ monitored based on the infrared plasmonic signal change with coverage. The phase transition is theoretically explained by total-energy and band-structure calculations. Accordingly, it can be understood in terms of the occupation of the originally half-filled one-dimensional band at the Fermi level. By annealing the system, the additional gold is removed from the surface and the plasmonic signal is recovered, which underlines the stability of the metallic structure. So, recent results on the infrared plasmonic signals of the Si(111)-5 脳 2-Au surface are supported. The understanding of potential one-dimensional electrical interconnects is improved.