Non-hydrodynamic collective modes in liquid metals and alloys

T Bryk - The European Physical Journal Special Topics, 2011 - Springer
A short review of analytical and numerical results, obtained for collective dynamics in liquid
metals and alloys within a theoretical approach of Generalized Collective Modes (GCM) is …

Observation of fast sound in two-dimensional dusty plasma liquids

Z Ge, D Huang, S Lu, C Liang, M Baggioli, Y Feng - Physical Review E, 2023 - APS
Equilibrium molecular dynamics simulations are performed to study two-dimensional (2D)
dusty plasma liquids. Based on the stochastic thermal motion of simulated particles, the …

Collective excitations in supercritical fluids: Analytical and molecular dynamics study of “positive” and “negative” dispersion

T Bryk, I Mryglod, T Scopigno, G Ruocco… - The Journal of …, 2010 - pubs.aip.org
The approach of generalized collective modes is applied to the study of dispersion curves of
collective excitations along isothermal lines of supercritical pure Lennard-Jones fluid. An …

Pressure-induced emergence of unusually high-frequency transverse excitations in a liquid alkali metal: Evidence of two types of collective excitations contributing to …

T Bryk, G Ruocco, T Scopigno… - The Journal of Chemical …, 2015 - pubs.aip.org
Unlike phonons in crystals, the collective excitations in liquids cannot be treated as
propagation of harmonic displacements of atoms around stable local energy minima. The …

Collective excitations in soft-sphere fluids

T Bryk, F Gorelli, G Ruocco, M Santoro, T Scopigno - Physical Review E, 2014 - APS
Despite that the thermodynamic distinction between a liquid and the corresponding gas
ceases to exist at the critical point, it has been recently shown that reminiscence of gaslike …

Nonacoustic high-frequency collective excitations in a ZrCuAl metallic glass

T Bryk, N Jakse, G Ruocco, JF Wax - Physical Review B, 2022 - APS
We report a combined theoretical and simulation study of collective excitations in the three-
component metallic glass Zr 46 Cu 46 Al 8. It is shown in that case how one can combine …

Microscopic self-dynamics in liquid Ne- mixtures: Quantum features and itinerant oscillators reexamined

D Colognesi, U Bafile, E Guarini, M Neumann - Physical Review E, 2024 - APS
In this paper, we report the results of a centroid molecular dynamics (CMD) study of the
canonical velocity autocorrelation functions (VACFs) in liquid Ne-D 2 mixtures at a …

Collective dynamics in liquid aluminium oxide: Ab initio analysis of collective eigenmodes

M Kopcha, T Bryk, JF Wax, N Jakse - Physical Review B, 2023 - APS
Collective dynamics in molten alumina is studied by a combination of ab initio molecular
dynamics (AIMD) simulations and theoretical analysis of time correlation functions. Two …

Is the mechanism of “fast sound” the same in liquids with long-range interactions and disparate mass metallic alloys?

T Bryk, AP Seitsonen, G Ruocco - The Journal of Chemical Physics, 2024 - pubs.aip.org
We present ab initio simulations of a large system of 2400 particles of molten NaCl to
investigate the behavior of collective mode dispersion beyond the hydrodynamic regime. In …

Charge density autocorrelation functions of molten salts: analytical treatment in the long-wavelength limit

T Bryk, I Mryglod - Journal of physics: Condensed Matter, 2004 - iopscience.iop.org
Nonhydrodynamic behaviour of charge density autocorrelation functions of molten salts is
discussed. It is shown analytically within the three-variable generalized collective modes …