Document Type

Article

Publication Date

4-17-2012

Publication Title

New Journal of Physics

ISSN

1367-2630

Volume

14

DOI

doi:10.1088/1367-2630/14/4/043018

Abstract

We show that, under achievable experimental conditions, a Bose–Einstein condensate of polar molecules can exhibit dielectric character. In particular, we derive a set of self-consistent mean-field equations that couple the condensate density to its electric dipole field, leading to the emergence of polarization modes that are coupled to the rich quasi-particle spectrum of the condensate. While the usual roton instability is suppressed in this system, the coupling can give rise to a phonon-like instability that is characteristic of a dielectric material with a negative static dielectric function.

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