Energy and power fluctuations in ac-driven coherent conductors

TL;DR

This paper analyzes energy and power fluctuations in ac-driven coherent conductors using a scattering matrix approach, revealing electron-hole correlation effects in energy noise and connecting theoretical predictions with recent experimental observations.

Contribution

It introduces a detailed analysis of energy current noise in ac-driven conductors, highlighting electron-hole correlations and reconciling previous charge noise studies with energy and power fluctuation observations.

Findings

Energy noise shows features due to electron-hole correlations.

Power fluctuations can reveal additional energy noise features.

Results are applicable to harmonic, bi-harmonic, and Lorentzian pulse driving.

Abstract

Using a scattering matrix approach we study transport in coherent conductors driven by a time-periodic bias voltage. We investigate the role of electron-like and hole-like excitations created by the driving in the energy current noise and we reconcile previous studies on charge current noise in this kind of systems. The energy noise reveals additional features due to electron-hole correlations. These features should be observable in power fluctuations. In particular, we show results for the case of a harmonic and bi-harmonic driving and of Lorentzian pulses applied to a two-terminal conductor, addressing the recent experiments of Refs. 1 and 2.