News

Sat January 1, 2011

Revealing the Superfluid Lambda Transition in the Unviersal Thermodynamics of a Unitary Fermi Gas

Fermi gases, collections of fermions such as neutrons and electrons, are found throughout nature, from solids to neutron stars. Interacting Fermi gases can form a superfluid or, for charged fermions, a superconductor. We have directly observed the superfluid phase transition in a strongly interacting Fermi gas via high-precision measurements of the local compressibility, density and...

News type:

Research Highlights

Sat January 1, 2011

Evolution of Fermion Pairing from Three to Two Dimensions

Interacting fermions in coupled two-dimensional (2D) layers present unique physical phenomena and are central to the description of unconventional superconductivity in high-transition-temperature cuprates and layered organic conductors. Reduced dimensionality enhances the effect of fluctuations, while interlayer coupling can stabilize superconductivity and even amplify the transition temperature. A fermionic superfluid loaded into a periodic potential should...

News type:

Research Highlights

Sat January 1, 2011

Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules

News type:

Research Highlights

Sat January 1, 2011

Laser Cooling and Real-Time Projective Measurement of Nuclear Spin Environment Using a Solid-State Qubit, Nature, 478 497-501 (2011).

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Research Highlights

Sat January 1, 2011

Speckle Imaging of Spin Fluctuations in a Strongly Interacting Fermi Gas

Spin fluctuations and density fluctuations are studied for a two-component gas of strongly interacting fermions along the BEC-BCS crossover [1]. Spin fluctuations are observed by directly measuring the difference in densities for the two spin states. This was done by using a probe laser which had equal detuning from both states, but with opposite signs.

News type:

Research Highlights

Sat January 1, 2011

Spin gradient demagnetization cooling of ultracold atoms

We have demonstrated a new cooling method in which a time-varying magnetic field gradient is applied to an ultracold spin mixture [1]. We prepare a two-component cloud of rubidium atoms, either in the superfluid or Mott insulator phase, in a strong field gradient separating the two components with a narrow mixed region between the pure-spin...

News type:

Research Highlights

Sat January 1, 2011