Transverse zero-sound waves in two-component Fermi liquid

2008 ◽  
Vol 35 (11) ◽  
pp. 323-327
Author(s):  
A. Yu. Romanov ◽  
V. P. Silin ◽  
S. A. Uryupin
Keyword(s):  
Fermi Liquid ◽  
Sound Waves ◽  
Zero Sound ◽  
Two Component

The viscosity and acoustic impedance of liquid helium-3

1965 ◽  
Vol 289 (1416) ◽  
pp. 34-45 ◽  
Keyword(s):  
Acoustic Impedance ◽  
Low Temperatures ◽  
Fermi Liquid ◽  
Relaxation Times ◽  
Thermal Relaxation ◽  
Sound Waves ◽  
Zero Sound ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
Thermal Relaxation Times

Previous experiments have shown that at low temperatures the acoustic impedance of liquid 3 He under the saturated vapour pressure rises by about 10% below about 0.092 °K. This rise is predicted by Landau’s theory of a Fermi liquid. It comes about because, at sufficiently low temperatures, sound waves in liquid 3 He are propagated as a new mode, the so-called zero sound. The present experiments study the dependence on pressure of the temperature and magnitude of the transition in the impedance. The transition temperature is shifted from 0.092 to about 0.07 °K on subjecting the liquid to a pressure of 12.5 atm, and the magnitude of the change considerably reduced. To interpret these results, measurements have also been made of the viscosity as a function of pressure. (These give information about the thermal relaxation times in the liquid.) All the results are in accord with the theory of zero sound in a Fermi liquid.

scholarly journals Propagation of shear stress in strongly interacting metallic Fermi liquids enhances transmission of terahertz radiation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
D. Valentinis ◽  
J. Zaanen ◽  
D. van der Marel
Keyword(s):  
Shear Stress ◽  
Terahertz Radiation ◽  
Fermi Liquid ◽  
Zero Sound ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
Collisionless Regime ◽  
Propagating Shear ◽  
Mass Enhancement

AbstractA highlight of Fermi-liquid phenomenology, as explored in neutral $$^3$$ 3 He, is the observation that in the collisionless regime shear stress propagates as if one is dealing with the transverse phonon of a solid. The existence of this “transverse zero sound” requires that the quasiparticle mass enhancement exceeds a critical value. Could such a propagating shear stress also exist in strongly correlated electron systems? Despite some noticeable differences with the neutral case in the Galilean continuum, we arrive at the verdict that transverse zero sound should be generic for mass enhancement higher than 3. We present an experimental setup that should be exquisitely sensitive in this regard: the transmission of terahertz radiation through a thin slab of heavy-fermion material will be strongly enhanced at low temperature and accompanied by giant oscillations, which reflect the interference between light itself and the “material photon” being the actual manifestation of transverse zero sound in the charged Fermi liquid.

scholarly journals Specificity of the second sound standing waves behavior in a medium with nanoparticles

2021 ◽  
Vol 2056 (1) ◽  
pp. 012040
Author(s):  
A A Esina ◽  
V B Efimov
Keyword(s):  
Normal Component ◽  
Experimental Studies ◽  
Standing Waves ◽  
Second Sound ◽  
Sound Waves ◽  
Two Component System ◽  
Component System ◽  
Two Component ◽  
Significant Attenuation ◽  
Waves Propagation

Abstract The experimental studies of the second sound waves propagation in a resonator with a deuterium-helium gel were carried out. The latest experimental results, combined with those obtained in earlier experiments, have shown that the propagation of the second sound waves in gels leads to their significant attenuation and a decrease in the propagation velocity. This behavior differs from the case of the propagation of the sound waves of a two-component system with a strongly slow normal component and may indicate changes in the properties of superfluidity under confined geometry conditions.

scholarly journals Matter sound waves in two-component Bose–Einstein condensates

2008 ◽  
Vol 41 (21) ◽  
pp. 215302 ◽  
Author(s):  
B B Baizakov ◽  
A M Kamchatnov ◽  
M Salerno
Keyword(s):  
Sound Waves ◽  
Two Component ◽  
Bose Einstein

The acoustic impedance of liquid helium-3

1965 ◽  
Vol 284 (1396) ◽  
pp. 125-136 ◽  
Keyword(s):  
Acoustic Impedance ◽  
Fermi Liquid ◽  
Quartz Crystal ◽  
Zero Sound ◽  
Saturated Vapour Pressure ◽  
Saturated Vapour ◽  
A Value ◽  
Reflexion Coefficient ◽  
Helium 3 ◽  
Good Agreement

Measurements have been made of the acoustic impedance ( Z ) of liquid 3 He under its saturated vapour pressure in the temperature range 0·035 to 0·6°K. A 1000 Mc/s sound wave is propagated along the axis of an X -cut quartz crystal, and undergoes many reflexions from each end of the crystal. Values are obtained for the reflexion coefficient at an interface between quartz and liquid 3 He by comparing the rate at which the signal decays in the crystal, with and without liquid 3 He present on the ends. These values then lead directly to the acoustic impedance ( Z ) of the liquid. Usually, Z / ρ (where ρ is the density) should be equal to the velocity of sound, and above 0·1°K this is found to be so. However, at about 0·1°K the value of Z / ρ increases abruptly, and at lower temperatures has a value about 10% greater. This result is in good agreement with Landau’s theory of a Fermi liquid, which relates the change in impedance with the propagation of a new mode of sound, the so-called 'zero-sound’.

Attenuation of Zero Sound in a Normal Fermi Liquid

1969 ◽  
Vol 185 (1) ◽  
pp. 384-392 ◽  
Author(s):  
C. J. Pethick
Keyword(s):  
Fermi Liquid ◽  
Zero Sound ◽  
Normal Fermi
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