title: Acoustic quasimodes in two-dimensional dispersed random media.
abstract: 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.
authors.affiliation: Department of Physics, Wuhan University, Wuhan 430072, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhengyou
authors.initials: Z
authors.lastname: Liu
authors.forename: Fugen
authors.initials: F
authors.lastname: Wu
authors.forename: Youyan
authors.initials: Y
authors.lastname: Liu