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Elastic band gaps in a fcc lattice of mercury spheres in aluminum

2002; American Physical Society; Volume: 66; Issue: 5 Linguagem: Inglês

10.1103/physrevb.66.052302

1095-3795

I. E. Psarobas, M. M. Sigalas,

Acoustic Wave Resonator Technologies

Elastic waves propagating in a periodic system consisting of mercury spheres arranged in a fcc lattice and surrounded by aluminum have been studied using the layer-multiple-scattering method. The band structure shows wide elastic band gaps along certain high-symmetry directions. For filling ratios of mercury spheres around 8.2%, there is a narrow full band gap with maximum width of the gap over mid-gap frequency of 2.5%. The full band gap can be further enhanced by using a heterostructure containing seven slabs of different sizes of mercury spheres and can be as wide as 14.4%.