Collective modes and gapped momentum states in liquid Ga: Experiment, theory, and simulation

• DOI: 10.1103/physrevb.101.214312
• Publication Date: 2020-06-29T20:02:29Z
• Authors: R. M. Khusnutdinoff; C. Cockrell; O. A. Dicks; A. C. S. Jensen; M. D. Le; L. Wang; M. T. Dove; A. V. Mokshin; V. V. Brazhkin; K. Trachenko
• Keywords: Momentum (technical analysis); Dispersion relation; Dynamics; Collective motion

Collective excitations in liquids are important for understanding liquid dynamical and thermodynamic properties. Gapped momentum states (GMS) a notable feature of dynamics predicted to operate the transverse collective excitations. Here, we combine inelastic neutron scattering experiments, theory, molecular modeling study GMS Ga wide range temperature $k$ points. We find that all three lines enquiry agree longitudinal dynamics. In dynamics, experiments with modeling, as well earlier x-ray at larger $k$, whereas theory observe emergence development gap dispersion relation which increases inverse relaxation time theoretically.