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Four-terminal resistance of an interacting quantum wire with weakly invasive contacts
Hugo Aita1, Liliana Arrachea, Carlos Naón
1Departamento de Física and IFLP, FCE, Universidad Nacional de La Plata, cc 67 (1900) La Plata, Argentina.
Abstract:
We analyze the behavior of the four-terminal resistance, relative to the two-terminal resistance of an interacting quantum wire with an impurity, taking into account the invasiveness of the voltage probes. We consider a one-dimensional Luttinger model of spinless fermions for the wire. We treat the coupling to the voltage probes perturbatively, within the framework of non-equilibrium Green function techniques. Our investigation unveils the combined effect of impurities, electron-electron interactions and invasiveness of the probes on the possible occurrence of negative resistance.
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