Phonon-polaritons in Bose-Einstein condensates induced by Casimir-Polder interaction with graphene
arXiv:1409.7801 · doi:10.1088/0953-8984/27/21/214011
Abstract
We consider the mechanical coupling between a two-dimensional Bose-Einstein condensate with a graphene sheet via the vacuum fluctuations of the electromagnetic field which are at the origin of the so-called Casimir-Polder potential. By deriving a self-consistent set of equations governing the dynamics of the condensate and the flexural (out-of-plane) modes of the graphene, we can show the formation of a new type of purely acoustic quasi-particle excitation, a phonon-polariton resulting from the coherent superposition of quanta of flexural and Bogoliubov modes.
6+epsilon pages, 4 figures
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