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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 2 Issue 3 (1998) pp 293-299
Comparison of tunneling through molecules with Mott-Hubbard and with dimerization gaps
J. Favand (a), F. Mila
Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse, France
Received: 17 November 1997 / Revised: 16 January 1998 / Accepted: 16 January 1998
Abstract: 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.
PACS. 73.40.Gk Tunneling - 73.61.Ph Polymers; organic compounds - 61.16.Ch Scanning probe microscopy; scanning tunneling, atomic force, scanning optical, magnetic force, etc.
(a) email: favand@irsamc2.ups-tlse.fr
Online publication: May 27, 1998
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