Bulk glass formation occurs over a very small part of phase space, and "good" glasses (which form even at low quench rates ~ 10K/sec) select an even smaller part of that accessible phase space. An axiomatic theory provides the physical basis of glass formation, and identifies these sweet spots of glass formation with existence of rigid but stress-free networks for which experimental evidence is rapidly emerging. Recently, theory and experiment have come together to show that these sweet spots of glass formation occur over a range of chemical compositions identified as Intermediate Phases. These ranges appear to be controlled by elements of local and medium range molecular structures that form isostatically rigid networks. Intermediate Phase glasses possess non-hysteretic glass transitions (Tgs) that do not age much. Raman scattering has played a pivotal role in elucidating molecular structure of glasses in general, and in identifying domains of Intermediate Phases. Experiments reveal these phases to possess sharp phase boundaries and to be characterized by an optical elasticity that varies with network mean coordination number, r, as power-law. In this review, we provide examples in chalcogenide and oxide glass systems where these phases along with optical elasticity power-laws have been established. Intermediate Phase glasses represent self-organized nanostructured functional materials optimized by nature.
Macroscopic active matter under confinement: dynamical heterogeneity, bursts, and glassy behavior in a few-body system of self-propelling camphor surfers
Université Paris-Saclay（巴黎萨克雷大学）；CNRS, IJCLab（法国国家科学研究中心，原子核与亚原子物理实验室）；Dipartimento di Fisica, Sapienza Università di Roma（罗马大学物理系）；Department of Physics, California State University Fullerton（加州州立大学富勒顿分校物理系）；Department of Chemistry, California State University Fullerton（加州州立大学富勒顿分校化学系）；Université de Toulouse（图卢兹大学）；CNRS, Laboratoire de Physique Théorique（法国国家科学研究中心，理论物理实验室）；CNRS, Centre de Biologie Intégrative（法国国家科学研究中心，综合生物学中心）
