Journal of Low Temperature Physics

, Volume 91, Issue 1–2, pp 13–37 | Cite as

Transverse waves in superfluid3He-B

  • G. F. Moores
  • J. A. Sauls
Article

Abstract

We examine the theory of collisionless transverse current waves in bulk superfluid3He-B, including the coupling to the order parameter collective modes. At low frequencies, Ω ≪ δ(T), the order parameter modes do not contribute to the restoring force for a transverse current, and the quasiparticle contribution drops rapidly as the gap in the spectrum develops. Thus, low-frequency transverse sound becomes overdamped at temperatures nearTc. However, at low temperatures (T ≲0.3Tc) the off-resonant coupling to the J = 2,M = +-1 modes stabilizes a propagating transverse current mode, with a large phase velocity and low damping for frequencies above a critical frequency that is approximately that of theJ = 2 mode. We also discuss the similarities and differences of longitudinal and transverse sound in the superfluid phases. For example, in zero field, right- and left-circularly polarized waves are degenerate. A magnetic field, with\(\overrightarrow \operatorname{H}||\overrightarrow {\text{q}}\), lifts this degeneracy, giving rise to the analog of circular dichroism and birefringence of electromagnetic waves. Thus, transverse waves may be more easily detected in the B-phase than in normal3He.

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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • G. F. Moores
    • 1
  • J. A. Sauls
    • 1
  1. 1.Department of Physics & AstronomyNorthwestern UniversityEvanston

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