Phys. Rev. B 56, 14631–14644 (1997)Collective modes in supersolid 4HeReceived 30 May 1997; published in the issue dated 1 December 1997 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. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.56.14631
DOI:
10.1103/PhysRevB.56.14631
PACS:
67.80.-s, 67.55.Fa, 67.90.+z
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