Center motions of nonoverlapping condensates coupled by long-range dipolar interaction in bilayer and multilayer stacks

Abstract

We investigate the effect of anisotropic and long-range dipole-dipole interaction (DDI) on the center motions of nonoverlapping Bose-Einstein condensates (BEC) in bilayer and multilayer stacks. In the bilayer, it is shown analytically that while DDI plays no role in the in-phase modes of center motions of condensates, out-of-phase mode frequency (${\omega }_o$) depends crucially on the strength of DDI ($a_d$). At the small-$a_d$ limit, ${\omega }_o^2(a_d)-{\omega }_o^2(0)\propto a_d$. In the multilayer stack, transverse modes associated with center motions of coupled condensates are found to be optical phonon like. At the long-wavelength limit, phonon velocity is proportional to ${\sqrt{a}}_d$.

arXiv comment7 pages, 5 figures

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Cited by in corpus (6)

• Dipolar Drag in Bilayer Harmonically Trapped Gases
• Stripe and checkerboard patterns in a stack of driven quasi-one-dimensional dipolar condensates
• Quadrupole oscillation in a dipolar Fermi gas: hydrodynamic vs collisionless regime
• Propagation of collective modes in non-overlapping dipolar Bose-Einstein condensates
• Density engineering via inter-condensate dipole-dipole interactions
• Finite-frequency normal and superfluid drag effects in two-component atomic Bose-Einstein condensates