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Scanning-gate-induced effects in nonlinear transport through nanostructures

Abstract : We investigate the effect of a scanning gate tip in the nonlinear quantum transport properties of nanostructures. Generally, we predict that the symmetry of the current-voltage characteristic in reflection-symmetric samples is broken by a tip-induced rectifying conductance correction. Moreover, in the case of a quantum point contact (QPC), the tip-induced rectification term becomes dominant as compared to the change of the linear conductance at large tip-QPC distances. Calculations for a weak tip probing a QPC modeled by an abrupt constriction show that these effects are experimentally observable.
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Contributor : Dietmar Weinmann Connect in order to contact the contributor
Submitted on : Wednesday, March 19, 2014 - 12:05:23 PM
Last modification on : Tuesday, December 14, 2021 - 3:18:50 AM

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Cosimo Gorini, Dietmar Weinmann, Rodolfo A. Jalabert. Scanning-gate-induced effects in nonlinear transport through nanostructures. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2014, 89, pp.115414. ⟨10.1103/PhysRevB.89.115414⟩. ⟨hal-00961023⟩



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