Goldstone modes in Larkin-Ovchinnikov-Fulde-Ferrell superconductors

Details Goldstone modes in Larkin-Ovchinnikov-Fulde-Ferrell superconductors Goldstone modes in Larkin-Ovchinnikov-Fulde-Ferrell superconductors

2010-03-10

arxiv.org/abs/1003.2194v2

Phys. Rev. B 81, 224507 (2010)

Physics

Condensed Matter

Superconductivity

11 pages, 2 figures; minor revisions to the text, added references

Scientific paper

In nonuniform Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) superconductors, both the gauge symmetry and the continuous translational symmetry of the normal state are spontaneously broken. This leads to additional bosonic excitations, or Goldstone modes, corresponding to the deformations of the order parameter amplitude modulation in real space. We derive general expressions for the energy of the phase and elastic Goldstone modes. As an example, the superfluid density and the elastic modulus of a one-dimensional LOFF superconductor are calculated at low temperatures.

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