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Back-action effects in charge detection

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arxiv 2503.03416 v1 pith:3DB55NZG submitted 2025-03-05 cond-mat.mes-hall cond-mat.str-el

Sarath Sankar , Matan Lotem , Joshua Folk , Eran Sela , Yigal Meir This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.str-el
keywords effectsimpurityback-actionchargedetectiondetectornon-equilibriumstrong
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Charge detection offers a powerful probe of mesoscopic structures based on quantum dots, but it also invariably results in measurement back-action (MBA). If strong, MBA can be detrimental to the physical properties being probed. In this work, we focus on the effects of MBA on an Anderson impurity model in which the impurity is coupled electrostatically to a detector. Introducing a novel non-perturbative method, we explore the interplay of coherent dynamics, strong correlations and non-equilibrium conditions. The effects of MBA can be seen most clearly in the temperature derivative of occupation. In the non-equilibrium case, we identify this as arising due to an energy flow from the detector to the impurity.

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  1. Direct signatures of Anderson orthogonality catastrophe in nonequilibrium quantum dots

    cond-mat.mes-hall 2025-07 conditional novelty 6.0 of 10

    The paper derives simple relations connecting the charge susceptibility, peak current, and entropy peak of a quantum dot to the Anderson orthogonality catastrophe exponent α under strong non-equilibrium bias.

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