Intensity of Coulomb Interaction between quasiparticles in diffusive metallic wires

TL;DR

This paper investigates the energy dependence and intensity of Coulomb interactions between quasiparticles in diffusive metallic wires using two experimental methods, finding agreement with theory for energy dependence but discrepancies in interaction strength.

Contribution

It compares two experimental approaches to measure Coulomb interactions, revealing consistent energy dependence but differing results on interaction intensity.

Findings

Energy dependence matches theoretical predictions in both experiments.

Interaction intensity agrees with theory in magnetoresistance measurements.

Discrepancies in interaction strength observed in energy distribution measurements.

Abstract

The energy dependence and intensity of Coulomb interaction between quasiparticles in metallic wires is obtained from two different methods: determination of the temperature dependence of the phase coherence time from the magnetoresistance, and measurements of the energy distribution function in out-of-equilibrium situations. In both types of experiment, the energy dependence of the Coulomb interaction is found to be in excellent agreement with theoretical predictions. In contrast, the intensity of the interaction agrees closely with theory only with the first method, whereas an important discrepancy is found using the second one. Different explanations are proposed, and results of a test experiment are presented.