Pair Density Waves and Vortices in an Elongated Spin-1/2Fermi Gas

Physical Simulation of Baroclinic Waves and Vortices in the Atmosphere

Observations of density fluctuations in an elongated Bose gas: ideal gas and quasicondensate regimes.

We report in situ measurements of density fluctuations in a quasi-one-dimensional 87Rb Bose gas at thermal equilibrium in an elongated harmonic trap. We observe an excess of fluctuations compared to the shot-noise level expected for uncorrelated atoms. At low atomic density, the measured excess is in good agreement with the expected "bunching" for an ideal Bose gas. At high density, the measure...

Gas in Shearing Density Waves

We examine the development of a transient spiral arm in a disk galaxy made up of both gas and stars. To this end we have performed numerical simulations in a shearing sheet (basically a rectangular patch of a disc) that contains gas in the form of clouds behaving like Brahic’s (1977) sticky particles, and stars that appear as a background continuum providing the perturbation forces. These are c...

Spatial resolution of spin waves in an ultracold gas.

We present the first spatially resolved images of spin waves in a gas. The complete longitudinal and transverse spin field as a function of time and space is reconstructed. Frequencies and damping rates for a standing-wave mode are extracted and compared with theory.

Spin and pair density wave glasses

Spontaneous breaking of translational symmetry—known as ‘density wave’ order—is common in nature. However such states are strongly sensitive to impurities or other forms of frozen disorder leading to fascinating glassy phenomena. We analyze impurity effects on a particularly ubiquitous form of broken translation symmetry in solids: a Spin Density Wave (SDW) with spatially modulated magnetic ord...