Hydrodynamics of Spatially Ordered Superfluids
H. T. C. Stoof, K. Mullen, M. Wallin, S. M. Girvin
Abstract
We derive the hydrodynamic equations for the supersolid and superhexatic phases of a neutral two-dimensional Bose fluid. We find, assuming that the normal part of the fluid is clamped to an underlying substrate, that both phases can sustain third-sound modes and that in the supersolid phase there are additional modes due to the superfluid motion of point defects (vacancies and interstitials).
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