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Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices (2012)
Journal Article
Esmann, M., Pritchard, J., & Weiss, C. (2012). Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices. Laser Physics Letters, 9(2), https://doi.org/10.1002/lapl.201110109

Fractional photon-assisted tunneling is investigated both numerically and analytically in a double-well lattice. While integer photon-assisted tunneling is a single-particle effect, fractional photon-assisted tunneling is an interaction-induced many-... Read More about Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices.

Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells (2012)
Journal Article
Weiss, C. (2012). Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(2), https://doi.org/10.1088/0953-4075/45/2/021002

For Bose–Einstein condensates in double wells, N-particle Rabi-like oscillations often seem to be damped. Far from being a decoherence effect, the apparent damping can indicate the emergence of quantum superpositions in the many-particle quantum dyna... Read More about Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells.

Coherence and instability in a driven Bose–Einstein condensate: a fully dynamical number-conserving approach (2012)
Journal Article
Billam, T., & Gardiner, S. (2012). Coherence and instability in a driven Bose–Einstein condensate: a fully dynamical number-conserving approach. New Journal of Physics, 14, Article 013038. https://doi.org/10.1088/1367-2630/14/1/013038

We consider a Bose–Einstein condensate driven by periodic delta-kicks. In contrast to first-order descriptions, which predict rapid, unbounded growth of the noncondensate in resonant parameter regimes, the consistent treatment of condensate depletion... Read More about Coherence and instability in a driven Bose–Einstein condensate: a fully dynamical number-conserving approach.

Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps (2012)
Journal Article
Billam, T., Wrathmall, S., & Gardiner, S. (2012). Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps. Physical Review A, 85(1), Article 013627. https://doi.org/10.1103/physreva.85.013627

We consider the ground state of an attractively interacting atomic Bose-Einstein condensate in a prolate, cylindrically symmetric harmonic trap. If a true quasi-one-dimensional limit is realized, then for sufficiently weak axial trapping this ground... Read More about Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps.

Correlated Photon Emission from Multiatom Rydberg Dark States (2012)
Journal Article
Pritchard, J., Adams, C., & Molmer, K. (2012). Correlated Photon Emission from Multiatom Rydberg Dark States. Physical Review Letters, 108(4), Article 043601. https://doi.org/10.1103/physrevlett.108.043601

We consider three-level atoms driven by two resonant light fields in a ladder scheme where the upper level is a highly excited Rydberg state. We show that the dipole-dipole interactions between Rydberg excited atoms prevents the formation of single p... Read More about Correlated Photon Emission from Multiatom Rydberg Dark States.

Magnetic transport apparatus for the production of ultracold atomic gases in the vicinity of a dielectric surface (2012)
Journal Article
Händel, S., Marchant, A., Wiles, T., Hopkins, S., & Cornish, S. (2012). Magnetic transport apparatus for the production of ultracold atomic gases in the vicinity of a dielectric surface. Review of Scientific Instruments, 83(1), Article 013105. https://doi.org/10.1063/1.3676161

We present an apparatus designed for studies of atom-surface interactions using quantum degenerate gases of 85Rb and 87Rb in the vicinity of a room temperature dielectric surface. The surface to be investigated is a super-polished face of a glass Dov... Read More about Magnetic transport apparatus for the production of ultracold atomic gases in the vicinity of a dielectric surface.

Activated nucleation of vortices in a Dipole-Blockaded Supersolid condensate (2012)
Journal Article
Mason, P., Josserand, C., & Rica, S. (2012). Activated nucleation of vortices in a Dipole-Blockaded Supersolid condensate. Physical Review Letters, 109(4), Article 045301. https://doi.org/10.1103/physrevlett.109.045301

We investigate theoretically and numerically a model of a supersolid in a dipole-blockaded Bose-Einstein condensate. The dependence of the superfluid fraction with an imposed thermal bath and a uniform boost velocity on the condensate is considered.... Read More about Activated nucleation of vortices in a Dipole-Blockaded Supersolid condensate.

Polarization spectroscopy of an excited state transition (2012)
Journal Article
Carr, C., Adams, C., & Weatherill, K. (2012). Polarization spectroscopy of an excited state transition. Optics Letters, 37(1), 118-120. https://doi.org/10.1364/ol.37.000118

We demonstrate polarization spectroscopy of an excited state transition in room-temperature cesium vapor. An anisotropy induced by a circularly polarized pump beam on the D2 transition is observed using a weak probe on the 6P3/2→7S1/2 transition. At... Read More about Polarization spectroscopy of an excited state transition.