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6 papers · 1 filter
Quantized circular motion of a trapped Bose-Einstein condensate: coherent rotation and vortices
Karl-Peter Marzlin, Weiping Zhang
We study the creation of vortex states in a trapped Bose-Einstein condensate by a rotating force. For a harmonic trapping potential the rotating force induces only a circular motio…
Vortex coupler for atomic Bose-Einstein condensates
Karl-Peter Marzlin, Weiping Zhang, Ewan M. Wright
A coherent coupler is proposed to spin a Bose-Einstein condensate composed of ultracold alkali atoms into a vortex state (VS). The proposal is based on a Raman transition induced b…
Collapse and revival of ultracold atoms in a microwave cavity and of photons in parametric down-conversion
Karl-Peter Marzlin, J"urgen Audretsch
We present a new theoretical method to study a trapped gas of bosonic two-level atoms interacting with a single mode of a microwave cavity. This interaction is described by a trili…
States insensitive to the Unruh effect in multi-level detectors
Karl-Peter Marzlin, J"urgen Audretsch
We give a general treatment of the spontaneous excitation rates and the non-relativistic Lamb shift of constantly accelerated multi-level atoms as a model for multi-level detectors…
Laser-induced Rotation of a Trapped Bose-Einstein Condensate
Karl-Peter Marzlin, Weiping Zhang
In this letter, atom optic techniques are proposed to control the excitation of a Bose-Einstein condensate in an atomic trap. We show that by employing the dipole potential induced…
Reluctant Paraphrase: Textual Restructuring under an Optimisation Model
Mark Dras
This paper develops a computational model of paraphrase under which text modification is carried out reluctantly; that is, there are external constraints, such as length or readabi…