Excitation spectra of strongly correlated lattice bosons and polaritons

@article{Pippan2009ExcitationSO,
  title={Excitation spectra of strongly correlated lattice bosons and polaritons},
  author={Peter Pippan and Hans Gerd Evertz and Martin Hohenadler},
  journal={Physical Review A},
  year={2009},
  volume={80},
  pages={033612}
}
Spectral properties of the Bose-Hubbard model and a recently proposed coupled-cavity model are studied by means of quantum Monte Carlo simulations in one dimension. Both models exhibit a quantum phase transition from a Mott insulator to a superfluid phase. The dynamic structure factor $S(k,\ensuremath{\omega})$ and the single-particle spectrum $A(k,\ensuremath{\omega})$ are calculated, focusing on the parameter region around the phase transition from the Mott insulator with density one to the… 

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* Present address: OSRAM Opto Semiconductors, 93055 Regensburg

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