Switching Between One and Two Dimensions: Conductivity of Pb-Induced Chain Structures on Si(557) | Zendy

Christoph Tegenkamp | Zendy; Z. Kallassy | Zendy; H. Pfnür | Zendy; H.L. Günter | Zendy; Volkmar Zielasek | Zendy; M. Henzler | Zendy

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Switching Between One and Two Dimensions: Conductivity of Pb-Induced Chain Structures on Si(557)

Author(s) -

Christoph Tegenkamp,

Z. Kallassy,

H. Pfnür,

H.L. Günter,

Volkmar Zielasek,

M. Henzler

Publication year - 2005

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.95.176804

Subject(s) - conductance , condensed matter physics , monolayer , anisotropy , scanning tunneling microscope , quantum tunnelling , conductivity , electrical resistivity and conductivity , materials science , chain (unit) , physics , phase transition , metal–insulator transition , nanotechnology , quantum mechanics

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 = 78 K, 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.

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