Effective Lagrangian and Topological Interactions in Supersolids

Details Effective Lagrangian and Topological Interactions in Supersolids Effective Lagrangian and Topological Interactions in Supersolids

2005-01-27

arxiv.org/abs/cond-mat/0501658v2

Phys.Rev.Lett. 94 (2005) 175301

Physics

Condensed Matter

Other Condensed Matter

10 pages, 1 figure; one reference added

Scientific paper

10.1103/PhysRevLett.94.175301

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.

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