Quasi-polaritons in Bose-Einstein condensates induced by Casimir-Polder interaction with graphene.

J Phys Condens Matter

Institut Pascal, PHOTON-N2, Clermont Université, Blaise Pascal University, CNRS, 24 Avenue des Landais, 63177 Aubière Cedex, France. Institute for Theoretical Physics, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria.

Published: June 2015

We consider the mechanical coupling between a two-dimensional Bose-Einstein condensate and 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 quasi-polariton resulting from the coherent superposition of quanta of flexural and Bogoliubov modes.

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Source
http://dx.doi.org/10.1088/0953-8984/27/21/214011DOI Listing

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