"A flat band in a band structure is a very special type of frequency band where the group velocity remains zero across all wavenumbers," Bilal explains. "In practical terms, this means that sound ...

Band gap energies of the passive film on Ti are relatively small that is one factor generating the excellent biocompatibility. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy ...

(a) Schematics of phononic crystal of different dimensionalities. (b) An example of phonon band structure. The orange area marks the forbidden band gap. (c) Examples of phononic crystals efficient at ...