Spatial structure of unstable normal modes in a glass-forming liquid

نویسندگان

چکیده

The phenomenology of glass-forming liquids is often described in terms their underlying, high-dimensional potential energy surface. In particular, the statistics stationary points sampled as a function temperature provides useful insight into thermodynamics and dynamics system. To make contact with real space physics, however, analysis spatial structure normal modes required. this work, we numerically study surface ternary mixture. Starting from liquid configurations equilibrated over broad range temperatures using swap Monte Carlo method, locate nearby investigate architecture energetics associated unstable modes. Through spatially-resolved analysis, originally developed to local minima, corroborate recent evidence that nature changes delocalized localized around mode-coupling temperature. We find displacement amplitudes have slowly decaying far field, whereas consist core large displacements rapidly field. fractal dimension mobility edge equal 1, consistent scaling participation ratio. Finally, below are structural defects, characterized by disordered markedly different liquid's locally favored structure. These defects similar those quasi-localized vibrations minima good candidates predict emergence excitations at low

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Spatial correlations of particle displacements in a glass-forming liquid

We de ne a generic correlation function that quanti es the spatial correlation of single-particle displacements in liquids and amorphous systems. We evaluate this function using computer simulations of an equilibrium glass-forming liquid, and show that the displacements of particles are spatially correlated over a range that grows with decreasing temperature as the glass transition is approache...

متن کامل

Temperature and pressure study of Brillouin transverse modes in the organic glass-forming liquid orthoterphenyl.

Transverse Brillouin spectra of orthoterphenyl are measured in the (250-305 K; 0.1-100 MPa) temperature-pressure range, which corresponds to the supercooled phase of this organic glass former. We show that the analysis of these spectra combined with an extrapolation of the reorientation times under pressure leads to an estimate of the static shear viscosity in a pressure range whose validity ex...

متن کامل

Spatial correlations of mobility and immobility in a glass-forming Lennard-Jones liquid.

Using extensive molecular dynamics simulations of an equilibrium, glass-forming Lennard-Jones mixture, we characterize in detail the local atomic motions. We show that spatial correlations exist among particles undergoing extremely large ("mobile") or extremely small ("immobile") displacements over a suitably chosen time interval. The immobile particles form the cores of relatively compact clus...

متن کامل

Role of structure in the α and β dynamics of a simple glass-forming liquid.

The elusive connection between dynamics and local structure in supercooled liquids is an important piece of the puzzle in the unsolved problem of the glass transition. The Johari-Goldstein β relaxation, ubiquitous in glass-forming liquids, exhibits mean properties that are strongly correlated to the long-time α dynamics. However, the former comprises simpler, more localized motion, and thus has...

متن کامل

Structural probe of a glass-forming liquid: generalized compressibility.

We introduce a structural quantity to probe the glass transition. This quantity is a linear generalized compressibility which depends solely on the positions of the particles. We have performed a molecular dynamics simulation on a glass-forming liquid consisting of a two-component mixture of soft spheres in three dimensions. As the temperature is lowered (or as the density is increased), the ge...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: SciPost physics

سال: 2021

ISSN: ['2542-4653']

DOI: https://doi.org/10.21468/scipostphys.10.1.001