Considering theoretically the transition between hydrodynamic and ballistic regimes in 2D semiconductors, we show that electrons in high-mobility 2D GaAs are by far the best system for the direct observation of collective hydrodynamic effects even in bulk transport properties independent of complicated transport features in narrow constrictions and small systems where Gurzhi phenomena are typically studied experimentally. We predict a strong hydrodynamics-induced generic violation of the Wiedeman-Franz law in bulk 2D GaAs systems for mobilities as modest as ${10}^6{\mathrm{cm}}^2/\text{Vs}$ and densities $1–5\times {10}^{11}{\mathrm{cm}}^{-2}$ in the temperature range of $T=1–40\text{K}$.

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• Semiconductors
• Two-dimensional electron system
• Boltzmann theory
• Hydrodynamics