Evolution of covalent networks under cooling: Contrasting the rigidity window and jamming scenarios

Le Yan, Matthieu Wyart

    Research output: Contribution to journalArticle

    Abstract

    We study the evolution of structural disorder under cooling in supercooled liquids, focusing on covalent networks. We introduce a model for the energy of networks that incorporates weak noncovalent interactions. We show that at low temperature these interactions considerably affect the network topology near the rigidity transition that occurs as the coordination increases. As a result, this transition becomes mean field and does not present a line of critical points previously argued for, the "rigidity window." Vibrational modes are then not fractons but instead are similar to the anomalous modes observed in packings of particles near jamming. These results suggest an alternative interpretation for the intermediate phase observed in chalcogenides.

    Original languageEnglish (US)
    Article number215504
    JournalPhysical Review Letters
    Volume113
    Issue number21
    DOIs
    StatePublished - Nov 21 2014

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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