The Amplitude Mode in the Quantum Phase Model

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We derive the collective low energy excitations of the quantum phase model of interacting lattice bosons within the superfluid state using a dynamical variational approach. We recover the well known sound (or Goldstone) mode and derive a gapped (Higgs type) mode that was overlooked in previous studies of the quantum phase model. This mode is relevant to ultracold atoms in a strong optical lattice potential. We predict the signature of the gapped mode in lattice modulation experiments and show how it evolves with increasing interaction strength.
4 pages, 3 figures

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Other Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/154290

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.4436
 http://arxiv.org/abs/0709.4436
 Phys. Rev. Lett. 100, 050404 (2008)
 doi:10.1103/PhysRevLett.100.050404

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arXiv