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Photons are emitted or absorbed by a nano-circuit under both equilibrium andnon-equilibrium situations. Here, we focus on the non-equilibrium situationarising due to a temperature difference between the leads of a quantum pointcontact, and study the finite frequency (colored) noise. We explore thisdelta-$T$ noise in the finite frequency regime for two systems: conventionalconductors described by Fermi liquid scattering theory and the fractionalquantum Hall system at Laughlin filling fractions, described by the chiralLuttinger liquid formalism. We study the emission noise, its expansion in thetemperature difference (focusing on the quadratic component) as well as theexcess emission noise defined with respect to a properly chosen equilibriumsituation. The behavior of these quantities are markedly different for thefractional quantum Hall system compared to Fermi liquids, signalling the roleof strong correlations. We briefly treat the strong backscattering regime ofthe fractional quantum Hall liquid, where a behavior closer to the Fermi liquidcase is observed.

Colored delta-T noise in Fractional Quantum Hall liquids