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.
abstract: 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.
authors.affiliation: Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.
authors.forename: Fabian
authors.initials: F
authors.lastname: Hötzel
authors.affiliation: Institute of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University Jena , Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: Kaori
authors.initials: K
authors.lastname: Seino
authors.affiliation: Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany.
authors.forename: Sandhya
authors.initials: S
authors.lastname: Chandola
authors.affiliation: Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany.
authors.forename: Eugen
authors.initials: E
authors.lastname: Speiser
authors.affiliation: Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany.
authors.forename: Norbert
authors.initials: N
authors.lastname: Esser
authors.affiliation: Institute of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University Jena , Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: Friedhelm
authors.initials: F
authors.lastname: Bechstedt
authors.affiliation: Kirchhoff Institute for Physics, Heidelberg University , Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.
authors.forename: Annemarie
authors.initials: A
authors.lastname: Pucci
keywords: electronic structure; infrared spectroscopy; metal-to-insulator transition; nanowire; plasmon; quasi one-dimensional electrons