3,547 research outputs found
Approximated center-of-mass motion for systems of interacting particles with space- and velocity-dependent friction and anharmonic potential
We study the center-of-mass motion in systems of trapped interacting
particles with space- and velocity-dependent friction and anharmonic traps. Our
approach, based on a dynamical ansatz assuming a fixed density profile, allows
us to obtain information at once for a wide range of binary interactions and
interaction strengths, at linear and nonlinear levels. Our findings are first
tested on different simple models by comparison with direct numerical
simulations. Then, we apply the method to characterize the motion of the center
of mass of a magneto-optical trap and its dependence on the number of trapped
atoms. Our predictions are compared with experiments performed on a large Rb85
magneto-optical trap.Comment: 9 pages, 8 figure
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Effects of Tropical Climate and Language Format on Imagery Ability Among French-Creole Bilinguals
International audienc
Coherent backscattering of light by cold atoms: theory meets experiment
Coherent backscattering (CBS) of quasi-resonant light by cold atoms presents
some specific features due to the internal structure of the atomic scatterers.
We present the first quantitative comparison between the experimentally
observed CBS cones and Monte-Carlo calculations which take into account the
shape of the atomic cloud as well as the internal atomic structure.Comment: 5 pages, 3 figures, to appear in Eur. Phys. Let
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Magnetic Field Enhanced Coherence Length in Cold Atomic Gases
We study the effect of an external magnetic field on coherent backscattering
of light from a cool rubidium vapor. We observe that the backscattering
enhancement factor can be {\it increased} with . This surprising behavior
shows that the coherence length of the system can be increased by applying a
magnetic field, in sharp contrast with ususal situations. This is mainly due to
the lifting of the degeneracy between Zeeman sublevels. We find good agreement
between our experimental data and a full Monte-Carlosimulation, taking into
account the magneto-optical effects and the geometry of the atomic cloud
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