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arXiv 1109.4977cond-mat.quant-gas
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极性分子的介电超流体

A Dielectric Superfluid of Polar Molecules

Ryan M. Wilson, Seth T. Rittenhouse, John L. Bohn

摘要:

我们表明,在可实现的实验条件下,极性分子的玻色-爱因斯坦凝聚体(BEC)可以表现出介电特性。特别是,我们推导出一组自洽的平均场方程,耦合的凝聚体密度,其电偶极子场,导致出现的极化模式,耦合到丰富的准粒子谱的凝聚体。虽然在这个系统中抑制了通常的旋子不稳定性,但耦合可以引起声子样不稳定性,这是具有负静态介电函数的介电材料的特征。

英文摘要:

We show that, under achievable experimental conditions, a Bose-Einstein condensate (BEC) 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 quasiparticle 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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