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100 1 _ |a Just, Sven
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245 _ _ |a Surface and Step Conductivities on Si(111) Surfaces
260 _ _ |a College Park, Md.
|c 2015
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520 _ _ |a Four-point measurements using a multitip scanning tunneling microscope are carried out in order to determine surface and step conductivities on Si(111) surfaces. In a first step, distance-dependent four-point measurements in the linear configuration are used in combination with an analytical three-layer model for charge transport to disentangle the 2D surface conductivity from nonsurface contributions. A termination of the Si(111) surface with either Bi or H results in the two limiting cases of a pure 2D or 3D conductance, respectively. In order to further disentangle the surface conductivity of the step-free surface from the contribution due to atomic steps, a square four-probe configuration is applied as a function of the rotation angle. In total, this combined approach leads to an atomic step conductivity of σstep=(29±9)  Ω−1 m−1 and to a step-free surface conductivity of σsurf=(9±2)×10−6  Ω−1/□ for the Si(111)−(7×7) surface.
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700 1 _ |a Blab, Marcus
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700 1 _ |a Korte, Stefan
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700 1 _ |a Cherepanov, Vasily
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700 1 _ |a Soltner, Helmut
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700 1 _ |a Voigtländer, Bert
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773 _ _ |a 10.1103/PhysRevLett.115.066801
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