Nonlinear acoustic effects in superfluid 3He-B

Ross H. McKenzie*, James A Sauls

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We consider the nonlinear interaction of zero sound with the collective modes of the order-parameter in superfluid 3He-B. The approximate particle-hole symmetry of the 3He-Fermi liquid determines selection rules for the linear and nonlinear coupling of zero sound to the collective modes. Starting from the quasiclassical theory of superfluid 3He, we have shown that the coupling strenghts have a simple representation in terms of Feynman diagrams. We predict measurable two-photon absorption and nonlinear-Raman scattering by the J = 2+ (real squashing) modes at low pressures. Recent observations of two-phonon absorption by a group in Helsinki are compared to the theoretical predictions. Two-phonon absorption can be used to determine the dispersion of the J = 2+ modes.

Original languageEnglish (US)
Pages (from-to)219-237
Number of pages19
JournalPhysica B: Physics of Condensed Matter
Issue number1-4
StatePublished - May 2 1992

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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