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The existence of a highly ordered, two-dimensional, Sn/Ag alloy on Si(111) is reported in this study. We present detailed atomic and electronic structures of the one atomic layer thick alloy, exhibiting a 2 x 2 periodicity. The electronic structure is metallic due to a free-electron-like surface band dispersing across the Fermi level. By electron doping, the electronic structure can be converted into a semiconducting state. A rotated Sn trimer constitutes the key structural element that could be identified by a detailed analysis of constant energy contours derived from the free-electron-like band.<p>Funding Agencies|Swedish Research Council|621-2010-37462008-6582|Linkoping Linnaeus Initiative for Novel Functional Materials (LiLi-NFM)||Knut and Alice Wallenberg foundation (KAW)||</p

physical review letters

Experimental and Theoretical Evidence of a Highly Ordered Two-Dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Sn</mml:mi><mml:mo>/</mml:mo><mml:mi>Ag</mml:mi></mml:math>Alloy on Si(111)

Experimental and Theoretical Evidence of a Highly Ordered Two-DimensionalSn/AgAlloy on Si(111)