Imperfect Fermi gas: Kinetic and interaction energies

Interaction-controlled transport of an ultracold fermi gas.

We explore the transport properties of an interacting Fermi gas in a three-dimensional optical lattice. The center of mass dynamics of the atoms after a sudden displacement of the trap minimum is monitored for different interaction strengths and lattice fillings. With increasingly strong attractive interactions the weakly damped oscillation, observed for the noninteracting case, turns into a sl...

Unconventional interaction between vortices in a polarized Fermi gas

Recently, a homogeneous superfluid state with a single gapless Fermi surface was predicted to be the ground state of an ultracold Fermi gas with spin population imbalance in the regime of molecular Bose-Einstein condensation. We study vortices in this novel state using a symmetry-based effective field theory, which captures the low-energy physics of gapless fermions and superfluid phase fluctua...

Dimensional enhancement of kinetic energies

The intensity of light radiated from independent dipoles is the number, N , of dipoles times the intensity of a single one. However, when the dipoles are located within a wavelength of the radiation the total intensity is N times the intensity of a single dipole [1]. This superradiance effect is due to constructive interference between the individual dipoles. In the present article, we propose ...

Kinetic energies in quantum solids.

Decay reactions of rare gas cluster ions: Kinetic energy release distributions and binding energies

We have carried out measurements on metastable fragmentation of mass selected argon cluster ions which are produced by electron impact ionization of a neutral argon cluster beam. From the shape of the fragment ion peaks (MIKE scan technique) one can deduce information about the distribution of kinetic energy that is released in the decay reaction. In this study, for Ar+5 to Ar + 15, it is Gauss...