News: 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.
Read More »
News type:
Research Highlights
Sat January 1, 2011

Interaction?induced orbital excitation blockade of ultracold atoms in an optical lattice arXiv:1105.5834v1. In press. [cond-mat.quant-gas]

Read More »
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).

Read More »
News type:
Research Highlights
Sat January 1, 2011

Optomechanical transducers for quantum information processing

Read More »
News type:
Research Highlights
Sat January 1, 2011

Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules

Read More »
News type:
Research Highlights
Sat January 1, 2011

Quantum Magnetism with Polar Alkali-Metal Dimers

Read More »
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...
Read More »
News type:
Research Highlights
Sat January 1, 2011

Relaxation of Fermionic Excitations in a Strongly Attractive Fermi Gas in an Optical Lattice, Phys. Rev. Lett., 107 145303 (2011).

Read More »
News type:
Research Highlights
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...
Read More »
News type:
Research Highlights
Sat January 1, 2011

Feynman diagrams versus Feynman quantum emulator

Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is usually plagued by the intricate quantum statistics at play. Here we present a cross-validation between a new theoretical approach, Bold Diagrammatic Monte Carlo (BDMC), and...
Read More »
News type:
Research Highlights