Effective Lagrangian and Topological Interactions in Supersolids
Abstract
We construct a lowenergy 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 lowenergy transverse elastic phonons by a superfluid vortex. The result is model independent.
 Publication:

Physical Review Letters
 Pub Date:
 May 2005
 DOI:
 10.1103/PhysRevLett.94.175301
 arXiv:
 arXiv:condmat/0501658
 Bibcode:
 2005PhRvL..94q5301S
 Keywords:

 67.80.s;
 11.10.Ef;
 Solid helium and related quantum crystals;
 Lagrangian and Hamiltonian approach;
 Other
 EPrint:
 10 pages, 1 figure