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Observation of resonance condensation of fermionic atom pairs.
In order to search for condensation on either side of the resonance, a technique that pairwise projects fermionic atoms onto molecules is introduced; this enables to measure the momentum distribution of fermionics atom pairs.
A High Phase-Space-Density Gas of Polar Molecules
An ultracold dense gas of potassium-rubidium (40K87Rb) polar molecules is created using a single step of STIRAP with two-frequency laser irradiation to coherently transfer extremely weakly bound KRb molecules to the rovibrational ground state of either the triplet or the singlet electronic ground molecular potential.
Emergence of a molecular Bose–Einstein condensate from a Fermi gas
This work reports the direct observation of a molecular Bose–Einstein condensate created solely by adjusting the interaction strength in an ultracold Fermi gas of atoms, which represents one extreme of the predicted BCS–BEC continuum.
Creation of ultracold molecules from a Fermi gas of atoms
The creation and quantitative characterization of ultracold 40K2 molecules is reported, which can be converted back to atoms by reversing the scan, and the small binding energy of the molecules is controlled by detuning the magnetic field away from the Feshbach resonance, and can be varied over a wide range.
Measurements of Tan's contact in an atomic Bose-Einstein condensate.
In the contact spectroscopy, in a region of observable beyond-mean-field effects, it is found that there is no measurable contribution from three-body physics.
Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate.
Measurements of the excitation spectrum of a strongly interacting Bose-Einstein condensate use two-photon Bragg spectroscopy and a magnetic-field Feshbach resonance to reach a regime where quantum depletion and beyond mean-field corrections to the condensates chemical potential are significant.
Production efficiency of ultracold feshbach molecules in bosonic and fermionic systems.
A novel model shows that the conversion efficiency of bosonic 85Rb and fermionic 40K when the magnetic field is swept across a Feshbach resonance is solely determined by the phase space density of the atomic cloud.
Controlling the quantum stereodynamics of ultracold bimolecular reactions
Molecular collisions in the quantum regime represent a new opportunity to explore chemical reactions. Recently, atom-exchange reactions were observed in a trapped ultracold gas of KRb molecules. In
Universal dynamics of a degenerate unitary Bose gas
Ultracold atoms could help in understanding the physics of strongly interacting many-body systems, but the creation of degenerate Bose gases at unitarity has been hampered by the losses. An
Observation of dipolar spin-exchange interactions with lattice-confined polar molecules
This work constitutes an initial exploration of the behaviour of many-body spin models with direct, long-range spin interactions and lays the groundwork for future studies of many -body dynamics in spin lattices.