Observation of interference between two molecular Bose-Einstein condensates

Abstract

We have observed interference between two Bose-Einstein condensates of weakly bound Feshbach molecules of fermionic ${}^6$Li atoms. Two condensates are prepared in a double-well trap and, after release from this trap, overlap in expansion. We detect a clear interference pattern that unambiguously demonstrates the de Broglie wavelength of molecules. We verify that only the condensate fraction shows interference. For increasing interaction strength, the pattern vanishes because elastic collisions during overlap remove particles from the condensate wave function. For strong interaction the condensates do not penetrate each other as they collide hydrodynamically.

References in corpus (33)

• Theory of Bose-Einstein condensation in trapped gases
• Theory of ultracold Fermi gases
• Atom Interferometers
• Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Berezinskii-Kosterlitz-Thouless Crossover in a Trapped Atomic Gas
• Observation of Bose-Einstein Condensation of Molecules
• Non-equilibrium coherence dynamics in one-dimensional Bose gases
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Atom interferometry with Bose-Einstein condensates in a double-well potential
• Production of Long-Lived Ultracold Li2 Molecules from a Fermi gas
• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms
• Precise determination of ${}^6$Li cold collision parameters by radio-frequency spectroscopy on weakly bound molecules
• Observation of vortex phase singularities in Bose-Einstein condensates
• Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
• Suppression and enhancement of impurity scattering in a Bose-Einstein condensate
• Expansion of an interacting Fermi gas
• Physics with Coherent Matter Waves
• Imaging the phase of an evolving Bose-Einstein condensate wavefunction
• Observation of shock waves in a strongly interacting Fermi gas
• Interferometric determination of the s- and d-wave scattering amplitudes in ${}^{87}$Rb
• Diatomic molecules in ultracold Fermi gases - Novel composite bosons
• Collective oscillations of a Fermi gas in the unitarity limit: Temperature effects and the role of pair correlations
• Finite-Temperature Collective Dynamics of a Fermi Gas in the BEC-BCS Crossover
• Elastic scattering loss of atoms from colliding Bose-Einstein condensate wavepackets
• Dynamics of a strongly interacting Fermi gas: the radial quadrupole mode
• Collisions between tunable halo dimers: exploring an elementary four-body process with identical bosons
• Superfluid Expansion of a Strongly Interacting Fermi Gas
• Interferences in the density of two Bose-Einstein condensates consisting of identical or different atoms
• High-Contrast Interference in a Thermal Cloud of Atoms
• Spatial interference from well-separated condensates
• Interaction-induced interference for two independent Bose-Einstein condensates
• Matter-wave interference in s-wave and p-wave Fermi condensates

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