Thu, April 14, 2011

The Bouncing Gas

This meeting will celebrate Professor Daniel Kleppner’s career of fundamental contributions in physics. An outstanding list of invited speakers will present the most recent and interesting topics in atomic physics.

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Thu, April 14, 2011

Bouncing Gas: Clouds of gases that bounce off Each Other Could help physicists model the behavior of high-temperature superconductors

The BEC conference is a biannual meeting which is regarded the most prestigious and competitive conference in the field of atomic quantum gases, featuring about 45 invited presentations. Several CUA researchers presented invited talks:

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Tue, February 15, 2011

AAAS Newcomb Cleveland Award (Most outstanding research paper published in Science 2010/2011) to Markus Greiner and coauthors

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Sat, January 1, 2011

A cryogenic beam of refractory, chemically reactive molecules with expansion cooling

Atomic and molecular beams have been valuable tools for precision measurement of atomic and molecular spectra for the past several decades.  In order to achieve good signal to noise in a beam spectroscopy experiment, it is important to have high fluxes, low forward velocity (to increase interaction time), and, in the case of molecules, cold...

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Sat, January 1, 2011

Cold Heteromolecular Dipolar Collisions

We present the first experimental observation of cold collisions between two different species of neutral polar molecules, each prepared in a single internal quantum state. Combining for the first time the techniques of Stark deceleration, magnetic trapping, and cryogenic buffer gas cooling allows the enhancement of molecular interaction time by 10,000. This has enabled an...

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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...

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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...

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Sat, January 1, 2011

Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules

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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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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.

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