▎ 摘　　要

Diffusion thermopower S-d is studied along with the scattering mechanisms and mobility mu by the Boltzmann transport equation technique in a bilayer graphene (BLG). Particular emphasis is made with respect to the sensitivity of S-d and mu to the possible scattering due to acoustic phonons (ap) and surface polar phonons (spp), charged impurity (ci) and short range disorder (sd). In the Bloch-Gruneisen regime, mu(ap) due to acoustic phonons shows T-4 behavior, a characteristic of 2D phonons, but with a small bump attributing to the chiral property of electrons. mu due to ci and sd are found to be almost independent of T. Numerical results of S-d, due to each of these mechanisms and the resultant, are presented as a function of temperature T and electron concentration n(s) for both supported and suspended BLG. The resultant S-d and that due to ap, ci and sd are found to be similar to T up to 100 K and vary sublinearly above this temperature. However, the range of linear T behavior will be larger for larger n(s). S-d due to sd is found to be dominant. A qualitative agreement is found with the experimental data. S-d similar to n(s)(-1) over the range of interest considered. S-d in suspended BLG is found to be greater than that in the supported one. (C) 2013 Elsevier B.V. All rights reserved.