Dispersion relations of the acoustic modes in divalent liquid metals

Acoustic phonon modes and dispersion relations of nanowire superlattices.

We study theoretically acoustic phonon modes in nanowire superlattices (NWSLs) composed of cubic materials. We classify the acoustic phonon modes in rectangular and square cross-section NWSLs, based on group theory. For NWSLs consisting of GaAs and AlAs, we calculate numerically the dispersion relations of each phonon mode and corresponding displacement fields. We examine the effects of both th...

Direct access to the dispersion relations of multiple anisotropic surface acoustic modes by Fourier image analysis

On a Nonlinear Dispersion Effect of Geodesic Acoustic Modes

Makoto SASAKI1,2), Kimitaka ITOH2,3), Naohiro KASUYA1,2), Klaus HALLATSCHEK2,4) and Sanae-I. ITOH1,2) 1)Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan 2)Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan 3)National Institute for Fusion Science, Gifu 509-5292, Japan 4)Centre for Interdisciplinary Plasma Science, Max-Planck I...

Non-hydrodynamic collective modes in liquid metals and alloys

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 presented. The GCM approach permits to represent dynamic structure factors in wide ranges of wave numbers and frequencies as a sum of contributions from hydrodynamic and non-hydrodynamic processes. The origin of c...

Ultrasonic Velocity Measurements in Liquid Metals Using Acoustic Wave Guides

The ultrasound Doppler velocimetry (UDV) is an innovative and non-invasive method to determine the velocity in liquid flows. Main advantages are the ability to investigate flows of opaque liquids and to deliver complete velocity profiles in real-time [1,2]. Therefore, the intention to apply this measuring technique to liquid metal flows is obvious with respect to the situation that until today ...