KIP publications

year 2015
author(s) Fabian Hötzel, Kaori Seino, Sandhya Chandola, Eugen Speiser, Norbert Esser, Friedhelm Bechstedt, Annemarie Pucci
title Metal-to-Insulator Transition in Au Chains on Si(111)-5×2-Au by Band Filling: Infrared Plasmonic Signal and Ab Initio Band Structure Calculation
KIP-Nummer HD-KIP 15-52
KIP-Gruppe(n) F6
document type Paper
source J. Phys. Chem. Lett 2015, 6, 3615-3620
doi 10.1021/acs.jpclett.5b01530
Abstract (en)

The Si(111)-5×2-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 5×2 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)-5×2-Au surface are supported. The understanding of potential one-dimensional electrical interconnects is improved.

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