An effective many-body theory for strongly interacting polar molecules

Abstract

We derive a general effective many-body theory for bosonic polar molecules in strong interaction regime, which cannot be correctly described by previous theories within the first Born approximation. The effective Hamiltonian has additional interaction terms, which surprisingly reduces the anisotropic features of dipolar interaction near the shape resonance regime. In the 2D system with dipole moment perpendicular to the plane, we find that the phonon dispersion scales as $\sqrt{|\bfp|}$ in the low momentum ($\bfp$) limit, showing the same low energy properties as a 2D charged Bose gas with Coulomb ($1/r$) interactions.

Same as published version (11 pages, 2 figure)

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Cited by in corpus (15)

• The physics of dipolar bosonic quantum gases
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• Pseudo-potential of a power-law decaying interaction in two-dimensional systems
• Differential Scattering and Rethermalization in Ultracold Dipolar Gases
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• Quantum phase diagrams of fermionic dipolar gases for an arbitrary orientation of dipole moment in a planar array of 1D tubes
• Interaction induced ferro-electricity in the rotational states of polar molecules
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• Roton softening and supersolidity in Rb spinor condensates
• Leggett mode in a two-component Fermi gas with dipolar interactions