Acoustic quasimodes in two-dimensional dispersed random media.
Using the generalized coherent-potential-approximation approach, we present the dispersion relation of the two-dimensional dispersed random media. In the intermediate-frequency regime, two acoustic modes are found in colloidal suspensions including cylindrical plastic rod in water background. The scattering cross section offers a good explanation for the two modes and the observed frequency gaps in the excitation spectra.
Zhang
Xin
X
Department of Physics, Wuhan University, Wuhan 430072, China.
Liu
Zhengyou
Z
Wu
Fugen
F
Liu
Youyan
Y