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Electron transport across a quantum wire in the presence of electron leakage to a substrate

Electron transport across a quantum wire in the presence of electron leakage to a substrate,10.1140/epjb/e2010-10452-x,European Physical Journal B,T.

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Electron transport across a quantum wire in the presence of electron leakage to a substrate  
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We investigate electron transport through a mono-atomic wire which is tunnel coupled to two electrodes and also to the underlying substrate. The setup is modeled by a tight-binding Hamiltonian and can be realized with a scanning tunnel microscope (STM). The transmission of the wire is obtained from the corresponding Green’s function. If the wire is scanned by the contacting STM tip, the conductance as a function of the tip position exhibits oscillations which may change significantly upon increasing the number of wire atoms. Our numerical studies reveal that the conductance depends strongly on whether or not the substrate electrons are localized. As a further ubiquitous feature, we observe the formation of charge oscillations.
Journal: European Physical Journal B - EUR PHYS J B , vol. 78, no. 1, pp. 75-81, 2010
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