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Article Dans Une Revue The European Physical Journal B: Condensed Matter and Complex Systems Année : 2006

Conductance of nano-systems with interactions coupled via conduction electrons: Effect of indirect exchange interactions

Résumé

A nano-system in which electrons interact and in contact with Fermi leads gives rise to an effective one-body scattering which depends on the presence of other scatterers in the attached leads. This non local effect is a pure many-body effect that one neglects when one takes non interacting models for describing quantum transport. This enhances the non-local character of the quantum conductance by exchange interactions of a type similar to the RKKY-interaction between local magnetic moments. A theoretical study of this effect is given assuming the Hartree-Fock approximation for spinless fermions in an infinite chain embedding two scatterers separated by a segment of length L_c. The fermions interact only inside the two scatterers. The dependence of one scatterer onto the other exhibits oscillations which decay as 1/L_c and which are suppressed when L_c exceeds the thermal length L_T. The Hartree-Fock results are compared with exact numerical results obtained with the embedding method and the DMRG algorithm.
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Dates et versions

hal-00077585 , version 1 (31-05-2006)
hal-00077585 , version 2 (06-11-2006)

Identifiants

Citer

Yoichi Asada, Axel Freyn, Jean-Louis Pichard. Conductance of nano-systems with interactions coupled via conduction electrons: Effect of indirect exchange interactions. The European Physical Journal B: Condensed Matter and Complex Systems, 2006, 53, pp.109-120. ⟨10.1140/epjb/e2006-00352-1⟩. ⟨hal-00077585v2⟩
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