Dipolar Bose-Einstein condensates with dipole-dependent scattering length

Abstract

We consider a Bose-Einstein condensate of polar molecules in a harmonic trap, where the effective dipole may be tuned by an external field. We demonstrate that taking into account the dependence of the scattering length on the dipole moment is essential to reproducing the correct energies and for predicting the stability of the condensate. We do this by comparing Gross-Pitaevskii calculations with diffusion Monte Carlo calculations. We find very good agreement between the results obtained by these two approaches once the dipole dependence of the scattering length is taken into account. We also examine the behavior of the condensate in non-isotropic traps.

References in corpus (4)

• Observation of dipole-dipole interaction in a degenerate quantum gas
• Quo vadis, cold molecules? - Editorial review
• Exact hydrodynamics of a trapped dipolar Bose-Einstein condensate
• Controlling collisions of ultracold atoms with dc electric fields

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• Critical Temperature of Weakly Interacting Dipolar Condensates
• Low-energy resonances and bound states of aligned bosonic and fermionic dipoles
• Bose-Einstein Condensation Temperature of Dipolar Gas in Anisotropic Harmonic Trap
• An effective many-body theory for strongly interacting polar molecules
• The low-energy excitation spectrum of one-dimensional dipolar quantum gases
• Numerical method for evolving the dipolar projected Gross-Pitaevskii equation
• Stability of Inhomogeneous Multi-Component Fermi Gases