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(Color online) characteristics of channels with different dimensions (group B: < 5 μm; group A: > 18 μm). The inset shows the estimated in these channels.
(Color online) Energy and momentum relaxation times as functions of the electric fields.
(Color online) Steady-state phonon occupancy (black symbols) in the momentum space as well as the corresponding energy (red symbols) and momentum (blue symbols) relaxation rates as functions of the wavevectors at different electron temperature with of 2 ps. All these curves are normalized by the equilibrium-state values.
(Color online) Calculated curves of energy loss rates in comparison with the experimental results (symbols) in groups A and B.
Dimensions of the GaN channels measured by optical microscope.
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