Intercomponent entanglement entropy and spectrum in binary Bose-Einstein condensates

@article{Yoshino2020IntercomponentEE,
  title={Intercomponent entanglement entropy and spectrum in binary Bose-Einstein condensates},
  author={Takumi Yoshino and Shunsuke Furukawa and Masahito Ueda},
  journal={arXiv: Quantum Gases},
  year={2020}
}
We study the entanglement entropy and spectrum between components in binary Bose-Einstein condensates in $d$ spatial dimensions. We employ effective field theory to show that the entanglement spectrum exhibits an anomalous square-root dispersion relation in the presence of an intercomponent tunneling (a Rabi coupling) and a gapped dispersion relation in its absence. These spectral features are associated with the emergence of long-range interactions in terms of the superfluid velocity and the… 

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