Phys. Rev. Lett. 94, 175301 (2005) [4 pages]Effective Lagrangian and Topological Interactions in SupersolidsReceived 4 February 2005; published 4 May 2005 We construct a low-energy effective Lagrangian describing zero temperature supersolids. Galilean invariance imposes strict constraints on the form of the effective Lagrangian. We identify a topological term in the Lagrangian that couples superfluid and crystalline modes. For small superfluid fractions, this interaction term is dominant in problems involving defects. As an illustration, we compute the differential cross section of scatterings of low-energy transverse elastic phonons by a superfluid vortex. The result is model independent. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.175301
DOI:
10.1103/PhysRevLett.94.175301
PACS:
67.80.-s, 11.10.Ef
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