Investigation of the lifetime of longitudinal phonons at GHz frequencies in liquid and solid4He

Berberich, P.; Leiderer, Paul; Hunklinger, Siegfried

doi:10.1007/bf00655215

Cited by 14 publications

(7 citation statements)

References 43 publications

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“…The sound attenuation measurements of Ref. [19] in helium at 23 bars and ω q = 2π × 1.1 GHz are indeed limited to T > 0.8 K where damping is still dominated by the rotons. Application to fermions -In cold-atom Fermi gases, interactions occur in s-wave between opposite-spin atoms.…”

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confidence: 87%

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Landau Phonon-Roton Theory Revisited for Superfluid He4 and Fermi Gases

2017

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Liquid helium and spin-1/2 cold-atom Fermi gases both exhibit in their superfluid phase two distinct types of excitations, gapless phonons and gapped rotons or fermionic pair-breaking excitations. In the long wavelength limit, revising and extending the theory of Landau and Khalatnikov initially developed for helium [Zh. Exp. Teor. Fiz. 19, 637 (1949)], we obtain universal expressions for three- and four-body couplings among these two types of excitations. We calculate the corresponding phonon damping rates at low temperature and compare them to those of a pure phononic origin in high-pressure liquid helium and in strongly interacting Fermi gases, paving the way to experimental observations.

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confidence: 87%

“…The erratum [42] that corrects this omission is reproduced here in appendix, see in particular Eqs. (19) and (20), and it is supplemented by a verification of the final result using a microscopic approach based on Bogoliubov theory with an arbitrary short-range interaction potential. -End of addition.…”

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confidence: 99%

Landau Phonon-Roton Theory Revisited for Superfluid He4 and Fermi Gases

2017

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“…A few years later, Berberich et al improved the latter method by monitoring the temporal decay of the probe pulse intensity, allowing a more accurate determination of the phonon lifetime. This way, they were able to measure the velocity and attenuation of phonons excited at about 700 MHz in superfluid helium-4 at saturated vapour pressure and at 23 bar [15].…”

Section: Stimulated Brillouin Scatteringmentioning

confidence: 99%

Stimulated Brillouin Gain Spectroscopy of Superfluid Helium-4

2021

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We report Stimulated Brillouin gain spectra of bulk superfluid helium-4. Stimulated Brillouin gain spectroscopy is a powerful optical method to probe the acoustic properties of liquid helium in a narrow spatio-temporal domain with moderate optical power and fast acquisition rates. We determine the velocity of first sound of superfluid helium-4 from the Stimulated Brillouin gain spectra between 0.90 K and 2.17 K and compare it to well known available data, which validate our experimental method.

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“…We have plotted the measurements obtained by P. Berberich et al [9] by Brillouin diffraction at 705 MHz on the same graph (Fig. 2).…”

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confidence: 94%

“…The (+) and (0) correspond respectively to values of k" given by the first and second resonance. Assuming a square frequency dependence (V) and (0) are the results of [5] and of [9]. The curve kí3 is our temperature dependent background.…”

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confidence: 99%