Comparison of tunneling through molecules with Mott-Hubbard and with dimerization gaps

Details Comparison of tunneling through molecules with Mott-Hubbard and with dimerization gaps Comparison of tunneling through molecules with Mott-Hubbard and with dimerization gaps

1998-02-03

arxiv.org/abs/cond-mat/9802031v1

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 22 pages including 7 figures. To appear in European Physical Journal B

Scientific paper

10.1007/s100510050252

In order to study the tunneling of electrons through an interacting, 1D, dimerized molecule connected to leads, we consider the persistent current in a ring embedding this molecule. We find numerically that, for spinless fermions, a molecule with a gap mostly due to interactions, i.e. a Mott-Hubbard gap, gives rise to a larger persistent current than a molecule with the same gap, but due only to the dimerization. In both cases, the tunneling current decreases exponentially with the size of the molecule, but more slowly in the interacting case. Implications for molecular electronic are briefly discussed.

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