Effect of flux-dependent Friedel oscillations upon the effective transmission of an interacting nano-system
نویسندگان
چکیده
We consider a nano-system connected to measurement probes via non interacting leads. When the electrons interact inside the nano-system, the coefficient |ts(EF )| describing its effective transmission at the Fermi energy EF ceases to be local. This effect of electron-electron interactions upon |ts(EF )| is studied using a one dimensional model of spinless fermions and the Hartree-Fock approximation. The non locality of |ts(EF )| 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 |ts(EF )| by an Aharonov-Bohm flux threading a ring which is attached to one lead at a distance Lc from the nano-system. For small distances Lc, the variation of the quantum conductance induced by this non local effect can exceed 0.1(e/h). PACS. 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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