Effect of flux-dependent Friedel oscillations upon the effective transmission of an interacting nano-system

A. Freyn () and J.-L. Pichard ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 58, issue 3, 279-290

Abstract: We consider a nano-system connected to measurement probes via non interacting leads. When the electrons interact inside the nano-system, the coefficient |t s (E F )| 2 describing its effective transmission at the Fermi energy E F ceases to be local. This effect of electron-electron interactions upon |t s (E F )| 2 is studied using a one dimensional model of spinless fermions and the Hartree-Fock approximation. The non locality of |t s (E F )| 2 is due to the coupling between the Hartree and Fock corrections inside the nano-system and the scatterers outside the nano-system via long range Friedel oscillations. Using this phenomenon, one can vary |t s (E F )| 2 by an Aharonov-Bohm flux threading a ring which is attached to one lead at a distance L c from the nano-system. For small distances L c , the variation of the quantum conductance induced by this non local effect can exceed 0.1 (e 2 /h). Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

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, 71.10.-w Theories and models of many-electron systems, (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00233-1

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