Interwire coupling for In(4x1) /Si(111) probed by surface transport

Frederik Edler, Ilio Miccoli, Stephanie Demuth, Herbert Pfnür, S. Wippermann, A. Lücke, W.G. Schmidt & Christoph Tegenkamp
The In/Si(111) system reveals an anisotropy in the electrical conductivity and is a prototype system for atomic wires on surfaces. We use this system to study and tune the interwire interaction by adsorption of oxygen. Through rotational square four-tip transport measurements, both the parallel (σ||) and perpendicular (σ⊥) components are measured separately. The analysis of the I(V) curves reveals that σ⊥ is also affected by adsorption of oxygen, showing clearly an effective interwire coupling, in...
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