Conductance of nano-systems with interactions coupled via
conduction electrons: effect of indirect exchange interactions |
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Authors: | Y Asada A Freyn J-L Pichard |
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Institution: | (1) Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Tokyo 152-8551, Japan;(2) Service de Physique de l'état Condensé (CNRS URA 2464), DSM/DRECAM/SPEC, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France |
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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 kF in an infinite chain embedding two scatterers
separated by a segment of length Lc. The fermions interact only inside
the two scatterers. The dependence of one scatterer onto the other exhibits
oscillations of period π/kF which decay as 1/Lc and
which are suppressed when Lc exceeds the thermal length
LT. The analytical results given by the Hartree-Fock
approximation are compared with exact numerical results obtained with
the embedding method and the DMRG algorithm. |
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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 |
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