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Atom interferometry with Bose-Einstein condensates in a double-well potential.
A trapped-atom interferometer was demonstrated using gaseous Bose-Einstein condensates coherently split by deforming an optical single-well potential into a double-well potential. The relative phase
Phase diagram of a two-component Fermi gas with resonant interactions
The phase diagram of a spin-polarized Fermi gas of 6Li atoms at unitarity is presented, experimentally mapping out the superfluid phases versus temperature and density imbalance and the implementation of an in situ ideal gas thermometer provides quantitative tests of theoretical calculations on the stability of resonant superfluidity.
Long phase coherence time and number squeezing of two Bose-Einstein condensates on an atom chip.
A rotationally sensitive (Sagnac) geometry for a guided atom interferometer by propagating the split condensates is demonstrated and enhanced coherence time is attributed to number squeezing of the initial state.
Determination of the superfluid gap in atomic Fermi gases by quasiparticle spectroscopy.
There is a smooth evolution in the nature of pairing correlations from pairing in the superfluid region to polaron binding in the highly polarized normal region, which leads to a local bimodal spectral response, which allowed us to determine the superfluids gap Delta and the Hartree energy U.
Observation of phase separation in a strongly interacting imbalanced fermi gas.
The in situ distribution of the density difference between two trapped spin components is obtained using phase-contrast imaging and 3D image reconstruction and the phase transition induces a dramatic change in the density profiles as excess fermions are expelled from the superfluid.
Band Gap Closing in a Synthetic Hall Tube of Neutral Fermions.
Momentum-resolved analysis of the quench dynamics reveals a critical point of band gap closing as one of the interleg coupling strengths is varied, which is consistent with a topological phase transition predicted for the Hall tube system.
Cooling Bose-Einstein Condensates Below 500 Picokelvin
Spin-polarized gaseous Bose-Einstein condensates were confined by a combination of gravitational and magnetic forces and evaporatively reduced in size to 2500 atoms, cooling the entire cloud in all three dimensions to a kinetic temperature of 450 ± 80 picokelvin.
Relaxation of superfluid turbulence in highly oblate Bose-Einstein condensates
We investigate thermal relaxation of superfluid turbulence in a highly oblate Bose-Einstein condensate. We generate turbulent flow in the condensate by sweeping the center region of the condensate
A continuous source of Bose-Einstein condensed atoms.
A continuous source of Bose-Einstein condensed sodium atoms was created by periodically replenishing a condensate held in an optical dipole trap with new condensates delivered using optical tweezers, raising the possibility of realizing a continuous atom laser.
Trapping of ultracold atoms in a hollow-core photonic crystal fiber
Ultracold sodium atoms have been trapped inside a hollow-core optical fiber. The atoms are transferred from a free-space optical dipole trap into a trap formed by a red-detuned Gaussian light mode