Damping of the Higgs and Nambu-Goldstone modes of superfluid Bose gases at finite temperatures

@article{Nagao2016DampingOT,
  title={Damping of the Higgs and Nambu-Goldstone modes of superfluid Bose gases at finite temperatures},
  author={Kazuma Nagao and Ippei Danshita},
  journal={arXiv: Quantum Gases},
  year={2016}
}
We study collective modes of superfluid Bose gases in optical lattices at commensurate fillings. We focus on the vicinity of the quantum phase transition to the Mott insulator, where there exists the Higgs amplitude mode in addition to the Nambu-Goldstone phase mode associated with the spontaneous U(1) symmetry breaking. We analyze finite-temperature effects on the damping of the collective modes by using an effective spin-1 model and the field theoretical methods based on the finite… 

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Introduction

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