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Abstract:
We consider the nonlinear interaction of zero sound with the collective modes of the order parameter
in superfluid 3He-B. Starting from the quasi-classical theory of superfluid 3He,
we derive equations describing a three-wave resonance between the J=2+ (real squashing) modes
and two zero-sound phonons at different frequencies. We point out similarities between the nonlinear
excitation of collective modes of the 3He-B order parameter and related effects in nonlinear
optical systems. In particular, it should be possible to observe stimulated Raman scattering of zero sound
and two-phonon absorption by the 2+ mode.
Paper: [PDF]
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