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arXiv · 2508.05413

Universal relations between thermoelectrics and noise in mesoscopic transport across a tunnel junction

Andrei I. Pavlov·Mikhail N. Kiselev
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Abstract

We develop a unified theory of weakly probed differential observables for currents and noise in transport experiments. Our findings uncover a set of universal transport relations between thermoelectric and noise properties of a system probed through a tunnel contact, with the Wiedemann-Franz law being just one example of such universality between charge and heat currents. We apply this theory to various quantum systems, including multichannel Kondo, quantum Hall and Sachdev-Ye-Kitaev quantum dots, resonant impurity, and two-stage Kondo models and demonstrate that each of the microscopic theories is characterized by a set of universal relations connecting conductance and thermoelectrics with noise. Violations of these relations indicate additional energy scales emerging in a system.

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Andrei I. Pavlov, Mikhail N. Kiselev. 2025-08-07. Universal relations between thermoelectrics and noise in mesoscopic transport across a tunnel junction. https://doi.org/10.1103/h5ty-45rf

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