Large-Scale Structure and Hyperuniformity of Amorphous Ices

Fausto Martelli, Salvatore Torquato, Nicolas Giovambattista, Roberto Car

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We investigate the large-scale structure of amorphous ices and transitions between their different forms by quantifying their large-scale density fluctuations. Specifically, we simulate the isothermal compression of low-density amorphous ice (LDA) and hexagonal ice to produce high-density amorphous ice (HDA). Both HDA and LDA are nearly hyperuniform; i.e., they are characterized by an anomalous suppression of large-scale density fluctuations. By contrast, in correspondence with the nonequilibrium phase transitions to HDA, the presence of structural heterogeneities strongly suppresses the hyperuniformity and the system becomes hyposurficial (devoid of "surface-area fluctuations"). Our investigation challenges the largely accepted "frozen-liquid" picture, which views glasses as structurally arrested liquids. Beyond implications for water, our findings enrich our understanding of pressure-induced structural transformations in glasses.

Original languageEnglish (US)
Article number136002
JournalPhysical review letters
Volume119
Issue number13
DOIs
StatePublished - Sep 29 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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