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Dependence of hot-phonon lifetime on electron density for GaN 2DEG channels (closed symbols, bottom scale) and for GaN at zero electric field (open circles, top scale). Green dashed curve is plasmon–LO-phonon model for GaN (top scale). Black symbols and black curve stand for low supplied power, red symbols, and red curve stand for high power, and blue curve corresponds to moderate power (solid curves guide the eye).
Dependence of hot-electron noise temperature on supplied electric power at room temperature for . Voltage pulse duration: (open stars, present paper) and 100 ns (closed stars, present paper).
Dependence of hot-phonon mode occupancy on supplied electric power at room temperature for (stars, present paper), and (squares, Ref. 27). Lines illustrate power independent hot-phonon lifetime: 270 fs (blue line) and 650 fs (red line).
Dependence of dynamic hot-phonon lifetime on supplied power at room temperature for (stars, present paper), and (squares, Ref. 22). Curves guide the eye.
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