▎ 摘　　要

We have studied, in bilayer graphene (BLG), the hot electron cooling power F-VP (T, n(s)) due to acoustic phonons via vector potential (VP) coupling. It is calculated as a function of electron concentration ns and temperature T and compared with F-DP (T, n(s)), the contribution from the deformation potential (DP) coupling. For the ns around 1 x 10(12) cm(-2), F-VP (T, n(s)) is much smaller than F-DP (T, n(s)). With increase of ns, F-DP (T, n(s)) decreases faster than F-VP (T, n(s)) does. A cross over is predicted and dominant contribution of F-VP (T, n(s)) can be observed at large ns. In the Bloch-Gruneisen (BG) regime F-VP (T, n(s)) similar to ns(-1/2) and F-DP (T, n(s)) similar to n(s)(-3/2). Both FVP (T, ns) and F-DP (T, n(s)) have the same T dependence with T 4 power law in the BG regime. Behaviour of FDP (T, ns) similar to ns(-3/2) and T-4 is in agreement with the experimental results at moderate ns. Besides, in the BG regime, we have predicted, for both the VP and DP coupling, a relation between F(T, n(s)) and the acoustic phonon limited mobility mu(p), opening a new door to determine mu(p) from the measurements of F(T, n(s))