Nature of excitations and defects in structural glasses
arXiv:1906.06894 · doi:10.1038/s41467-019-13010-x
Abstract
The nature of defects in amorphous materials, analogous to vacancies and dislocations in crystals, remains elusive. Here we explore their nature in a three-dimensional microscopic model glass-former which describes granular, colloidal, atomic and molecular glasses by changing the temperature and density. We find that all glasses evolve in a very rough energy landscape, with a hierarchy of barrier sizes corresponding to both localized and delocalized excitations. Collective excitations dominate in the jamming regime relevant for granular and colloidal glasses. By moving gradually to larger densities describing atomic and molecular glasses, the system crosses over to a regime dominated by localized defects and relatively simpler landscapes. We quantify the energy and temperature scales associated to these defects and their evolution with density. Our result pave the way to a systematic study of low-temperature physics in a broad range of physical conditions and glassy materials.
arXiv comment11 pages, 8 figures
References in corpus (28)
- Supercooled Liquids for Pedestrians
- Fractal free energy landscapes in structural glasses
- Geometric origin of excess low-frequency vibrational modes in amorphous solids
- Modeling the mechanics of amorphous solids at different length and time scales
- Continuum limit of the vibrational properties of amorphous solids
- Statistics and properties of low-frequency vibrational modes in structural glasses
- Marginal Stability in Structural, Spin and Electron Glasses
- Fast Monte Carlo algorithm for supercooled soft spheres
- Vibrational instability, two-level systems and Boson peak in glasses
- Suppression of tunneling two-level systems in ultrastable glasses of indomethacin
- Growing timescales and lengthscales characterizing vibrations of amorphous solids
- Compressing nearly hard sphere fluids increases glass fragility
- On the density of shear transformation zones in amorphous solids
- Do Athermal Amorphous Solids Exist?
- Breakdown of Elasticity in Amorphous Solids
- Dynamic criticality at the jamming transition
- Efficient swap algorithms for molecular dynamics simulations of equilibrium supercooled liquids
- Spatial structure of quasi-localized vibrations in nearly jammed amorphous solids
- Disappearance of the de Almeida-Thouless line in six dimensions
- Generalization of the cavity method for adiabatic evolution of Gibbs states
- Absence of Marginal Stability in a Structural Glass
- Rejuvenation and Memory Effects in a Structural Glass
- The Gardner transition in physical dimensions
- Theory of harmonic dissipation in disordered solids
- Spin-glass--like aging in colloidal and granular glasses
- Marginally stable phases in mean-field structural glasses
- How Generic are the Robust Theoretical Aspects of Jamming in Hard Sphere Models?
- The response of jammed packings to thermal fluctuations
Cited by in corpus (25)
- Thirty milliseconds in the life of a supercooled liquid
- Modern computational studies of the glass transition
- Nonlinear quasilocalized excitations in glasses. I. True representatives of soft spots
- Relaxation dynamics in the energy landscape of glass-forming liquids
- Thermal origin of quasi-localised excitations in glasses
- The nature of non-phononic excitations in disordered systems
- The glass transition in molecules, colloids and grains: universality and specificity
- Dynamical mean-field theory: from ecosystems to reaction networks
- An exploratory study of the glassy landscape near jamming
- Computer simulations of the glass transition and glassy materials
- Stable glassy configurations of the Kob-Andersen model using swap Monte Carlo
- Microscopic observation of two-level systems in a metallic glass model
- Searching for the Gardner transition in glassy glycerol
- Mean-field description for the architecture of low-energy excitations in glasses
- Renormalization of elastic quadrupoles in amorphous solids
- Intermittent rearrangements accompanying thermal fluctuations distinguish glasses from crystals
- Dynamic Gardner crossover in a simple structural glass
- Computational Methods toward Ultrastable Glasses
- The Gardner correlation length scale in glasses
- Does mesoscopic elasticity control viscous slowing down in glassforming liquids?
- Collective excitations in jammed states: ultrafast defect propagation and finite-size scaling
- Bond-space operator disentangles quasi-localized and phononic modes in structural glasses
- Athermal Jamming vs. glassy dynamics for particles with exponentially decaying repulsive pair interaction potentials with a cutoff
- The Statistical Mechanics of Indistinguishable Energy States and the Glass Transition
- Arresting dynamics in hardcore spin models