Parametric excitation of the J = 2+ modes by zero sound in superfluid 3He-B

James A Sauls*, Ross H. McKenzie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We discuss order-parameter collective modes in weakly inhomogenous states of superfluid 3He-B, i.e., states in which the scale of the inhomogeneities is considerably longer than the coherence length ξ0 = vf/2πTc and the energy associated with the inhomogeneity is small compared to the condensation energy. The theory describes resonance phenomena between order-parameter modes and zero sound. We discuss two specific cases, both of which involve excitation of the J = 2+ modes via a parametric field that lifts the selection rule due to particle-hole symmetry. In the case of a static superflow the modes with J = 2+, M = ±1 couple to sound for q{norm of matrix}H, and should be observable as Zeeman states with a maximum absorption that scales as the square of the superflow velocity. The J = 2+ modes may also be excited parametrically in a three-wave resonance process involving two zero-sound phonons. We summarize the nonlinear response theory for two-photon excitation of these modes.

Original languageEnglish (US)
Pages (from-to)170-176
Number of pages7
JournalPhysica B: Physics of Condensed Matter
Volume169
Issue number1-4
DOIs
StatePublished - Feb 2 1991

ASJC Scopus subject areas

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

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