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Article Dans Une Revue Journal of Low Temperature Physics Année : 2019

Transport and Phonon Damping in 4He

Résumé

The dynamic structure function S(k, ω) informs about the dispersion and damping of excitations. We have recently (Phys. Rev. B 97, 184520 (2018)) compared experimental results for S(k, ω) from high-precision neutron scattering experiments and theoretical results using the "dynamic many-body theory" (DMBT), showing excellent agreement over the whole experimentally accessible pressure regime. This paper focuses on the specific aspect of the propagation of low-energy phonons. We report calculations of the phonon mean-free path and phonon life time in liquid 4 He as a function of wave length and pressure. Historically, the question was of interest for experiments of quantum evaporation. More recently, there is interest in the potential use of 4 He as a detector for low-energy dark matter (K. Schulz and Kathryn M. Zurek, Phys. Rev. Lett. 117, 121302 (2016)). While the mean free path of long wave length phonons is large, phonons of intermediate energy can have a short mean free path of the order of µm. Comparison of different levels of theory indicate that reliable predictions of the phonon mean free path can be made only by using the most advanced many-body method available, namely, DMBT.
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Dates et versions

hal-02334211 , version 1 (25-10-2019)

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K. Beauvois, Henri Godfrin, E. Krotscheck, R. Zillich. Transport and Phonon Damping in 4He. Journal of Low Temperature Physics, 2019, 197 (3-4), pp.113-129. ⟨10.1007/s10909-019-02219-1⟩. ⟨hal-02334211⟩

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