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 E-Mail Tsukuba, Japan - A team of researchers lead by the University of Tsukuba have created a new theoretical model to understand the spread of vibrations through disordered materials, such as glass. They found that as the degree of disorder increased, sound waves traveled less and less like ballistic particles, and instead began diffusing incoherently. This work may lead to new heat- and shatter-resistant glass for smartphones and tablets. Understanding the possible vibrational modes in a material is important for controlling its optical, thermal, and mechanical properties. The propagation of vibrations in the form of sound of a single frequency through amorphous materials can occur in a unified way, as if it was a particle. Scientists like to call these quasiparticles phonons. However, this approximation can break down if the material is too disordered, which limits our ability to predict the strength of glass under a wide range of circumstances.

United kingdomFisica teoricaMatteo baggioliTatsuya moriAlessio zacconeUniversity of cambridgeUniversity of tsukubaProfessor tatsuyaProfessor alessio zacconeProfessor matteo baggioliInstituto de fisica teoricaChemical physicsChemistry physics materials sciencesAtomic molecular particle physicsIndustrial engineering chemistryAtomic physics