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Switching between one and two dimensions: Conductivity of Pb-induced chain structures on Si(557)
Authors
H.-L. Günter
M. Henzler
+4 more
Z. Kallassy
Herbert Pfnür
Christoph Tegenkamp
V. Zielasek
Publication date
1 January 2005
Publisher
College Park, MD : American Physical Society
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Abstract
We show in a combined study of four-point conductance measurement and tunneling microscopy that surface state conductance induced by one monolayer of Pb on Si(557) can be quasi one dimensional with conductivity values close to typical three-dimensional metals. At a critical temperature of Tc=78K, associated with an order-disorder phase transition and a tenfold superperiodicity along the Pb chains, the system switches from low to high conductance anisotropy, with a semiconductor-insulator transition in the direction perpendicular to the chain structure, while along the chains conductance with a (1/T+const) temperature dependence was found. © 2005 The American Physical Society
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Institutionelles Repositorium der Leibniz Universität Hannover
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Last time updated on 18/04/2018