Collective Modes in Supersolid 4He

Details Collective Modes in Supersolid 4He Collective Modes in Supersolid 4He

1997-05-30

arxiv.org/abs/cond-mat/9705307v1

Physics

Condensed Matter

38 pages of ReVTeX and 1 postscript figure. Submitted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.56.14631

We derive the hydrodynamic equations of motion of solid and supersolid 4He, that describe the collective modes of these phases. In particular, the usual hydrodynamics is modified in such a way that it leads to the presence of a propagating instead of a diffusive defect mode. The former is appropriate for a quantum crystal and observed in recent experiments. Furthermore, we find that in supersolid helium there are two additional modes associated with the superfluid degrees of freedom. The observation of these additional modes is a clear experimental signature of the supersolid phase.

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