Figure 1From: Acoustic phonon modes and phononic bandgaps in GaN/AlN nanowire superlatticesPhonon dispersion relations of the circular cross-section GaN/AlN NWSL. (a) R = 5.0 nm and D = 20.0 nm; (b) R = 5.0 nm and D = 45.0 nm (thicknesses of GaN and AlN layers are 25.0 and 20.0 nm, respectively). The B2 modes exist in higher frequency range, and all the E modes are doubly degenerated.Back to article page