title: Metamaterial with simultaneously negative bulk modulus and mass density.
abstract: We report a metamaterial which simultaneously possesses a negative bulk modulus and mass density. This metamaterial is a zinc blende structure consisting of one fcc array of bubble-contained-water spheres (BWSs) and another relatively shifted fcc array of rubber-coated-gold spheres (RGSs) in epoxy matrix. The negative bulk modulus and mass density are simultaneously derived from the coexistent monopolar resonances from the embedded BWSs and dipolar resonances from the embedded RGSs. The Poisson ratio of the metamaterial also turns negative near the resonance frequency.
authors.affiliation: Key Lab of Acoustic and Photonic materials and devices of Ministry of Education and Department of Physics, Wuhan University, Wuhan 430072, China.
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Ding
authors.forename: Zhengyou
authors.initials: Z
authors.lastname: Liu
authors.forename: Chunyin
authors.initials: C
authors.lastname: Qiu
authors.forename: Jing
authors.initials: J
authors.lastname: Shi