The onset of nonequilibrium in a driven Anderson insulator is identified by monitoring the system with two thermometers. Features of nonequilibrium appear at surprisingly weak drive intensity demonstrating, among other things, that conductivity may not be a reliable thermometer for ensuring linear-response conditions. In addition, the spectral contents of the applied field could be more important to take the system out of equilibrium than its absorbed power. Ensuing hot-electron transport effects and the nontrivial role phonons play in driven quantum systems are pointed out.

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• Electrical properties
• Nonequilibrium statistical mechanics
• Nonequilibrium systems