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21. 


Conductance of a molecular wire attached to mesoscopic leads: contact effects



G. Cuniberti, G. Fagas, and K. Richter

Acta Physica Polonica B 32, 437 (2001)

We study linear electron transport through a molecular wire sandwiched between nanotube leads. We show that the presence of such electrodes strongly influences the calculated conductance. We find that depending on the quality and geometry of the contacts between the molecule and the tubular reservoirs, linear transport can be tuned between an effective Newns spectral behavior and a more structured one. The latter strongly depends on the topology of the leads. We also provide analytical evidence for an anomalous behavior of the conductance as a function of the contact strength.



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