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

Y. Asada, A. Freyn and J.-L. Pichard

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 53, issue 1, 109-120

Abstract: 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 of Fermi momentum k F 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 of period π/k F which decay as 1/L c and which are suppressed when L c exceeds the thermal length L T . The analytical results given by the Hartree-Fock approximation are compared with exact numerical results obtained with the embedding method and the DMRG algorithm. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 71.27.+a Strongly correlated electron systems; heavy fermions, 72.10.-d Theory of electronic transport; scattering mechanisms, 73.23.-b Electronic transport in mesoscopic systems, (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00352-1

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