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We analyze the data of the recent paper Nature 559, 205 (2018) and show thatit contains an observation of thermal and electric conductivities of the dopinglayers in GaAs/AlGaAs heterostructures which violates the Wiedemann-Franz law.Namely, the measured thermal conductivity of the doping layers is similar tothat of a metal while the electrical conductivity is exponentially small. Wefind that these results may be related to the exciton contribution to thermalconductivity calculated in several recent theoretical works for metallicsamples.

Giant violation of Wiedemann-Franz law in doping layers of modern AlGaAs heterostructures