We present an experimental and simulation study of the collective dynamics of liquid D2 in the range of exchanged wave vectors 3≤Q≤14nm-1. Neutron Brillouin scattering results for the center-of-mass dynamic structure factor of this moderately quantum fluid are compared, on an absolute scale, with those obtained by three different quantum simulation methods such as ring polymer molecular dynamics and two versions of the Feynman-Kleinert approach. The experimental data can be well described by dynamical models typically used for liquids. Some discrepancies show up both among simulations, and between simulations and experimental data. Such discrepancies are found to mainly concern the damping of the propagating sound modes.

Collective dynamics of liquid deuterium : Neutron scattering and approximate quantum simulation methods / E. Guarini, F. Barocchi, A. De Francesco, F. Formisano, A. Laloni, U. Bafile, M. Celli, D. Colognesi, R. Magli, A. Cunsolo, M. Neumann. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 104:17(2021 Nov 10), pp. 174204.1-174204.20. [10.1103/PhysRevB.104.174204]

Collective dynamics of liquid deuterium : Neutron scattering and approximate quantum simulation methods

R. Magli;
2021

Abstract

We present an experimental and simulation study of the collective dynamics of liquid D2 in the range of exchanged wave vectors 3≤Q≤14nm-1. Neutron Brillouin scattering results for the center-of-mass dynamic structure factor of this moderately quantum fluid are compared, on an absolute scale, with those obtained by three different quantum simulation methods such as ring polymer molecular dynamics and two versions of the Feynman-Kleinert approach. The experimental data can be well described by dynamical models typically used for liquids. Some discrepancies show up both among simulations, and between simulations and experimental data. Such discrepancies are found to mainly concern the damping of the propagating sound modes.
Neutron Brillouin scattering; Dynamic structure factor; Collective dynamics; Quantum simulations; Liquid deuterium
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/888364
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