Cotrapping different species in ion traps using multiple radio frequencies
PHYSICAL REVIEW A 94:2 (2016) ARTN 023609
Hubbard model for atomic impurities bound by the vortex lattice of a rotating BEC
Physical Review Letters American Physical Society 116:24 (2016) 240402
Abstract:
We investigate cold bosonic impurity atoms trapped in a vortex lattice formed by condensed bosons of another species. We describe the dynamics of the impurities by a bosonic Hubbard model containing occupation-dependent parameters to capture the effects of strong impurity-impurity interactions. These include both a repulsive direct interaction and an attractive effective interaction mediated by the BEC. The occupation dependence of these two competing interactions drastically affects the Hubbard model phase diagram, including causing the disappearance of some Mott lobes.Design of a millimetre-scale magnetic surface trap for cold atoms
Journal of Physics B Atomic Molecular and Optical Physics IOP Publishing 47:7 (2014) 075302
Precise shaping of laser light by an acousto-optic deflector.
Optics express 21:21 (2013) 24837-24846
Abstract:
We present a laser beam shaping method using acousto-optic deflection of light and discuss its application to dipole trapping of ultracold atoms. By driving the acousto-optic deflector with multiple frequencies, we generate an array of overlapping diffraction-limited beams that combine to form an arbitrary-shaped smooth and continuous trapping potential. Confinement of atoms in a flat-bottomed potential formed by a laser beam with uniform intensity over its central region confers numerous advantages over the harmonic confinement intrinsic to Gaussian beam dipole traps and many other trapping schemes. We demonstrate the versatility of this beam shaping method by generating potentials with large flat-topped regions as well as intensity patterns that compensate for residual external potentials to create a uniform background to which the trapping potential of experimental interest can be added.Bose gas: Theory and experiment
, 2012