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Dispersión de nubes at ómicas frías por haces de luz estructurada

Temixco, septiembre 2012. Dispersión de nubes at ómicas frías por haces de luz estructurada. R. Jáuregui Instituto de Física UNAM rocio@fisica.unam.mx. Scattering of dilute thermal atomic clouds by structured beams.

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Dispersión de nubes at ómicas frías por haces de luz estructurada

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  1. Temixco, septiembre 2012 Dispersión de nubes atómicas frías por haces de luz estructurada R. Jáuregui Instituto de Física UNAM rocio@fisica.unam.mx

  2. Scattering of dilute thermal atomic clouds by structured beams • Experimental and theoretical results for the scattering effects on free falling dilute thermal atomic clouds that traverse a microscopically structured laser beam with parabolic symmetry. • The dynamics of the phase space distribution is studied. • As previously proposed, the atomic clouds were observed to split into two or more clouds with a well defined distribution of velocities. • It is shown that the product of the angular momentum along the axis of main propagation of the laser beam with the linear momentum along one of the directions perpendicular to that axis is directly transmitted from the light beam to the atomic cloud.

  3. General framework • Predesigned structured light playing the role for cold matter that crystals or material cavities play for light. • Structured photons? • Transfer of dynamical variables from light to matter

  4. Structured light beams • Plane waves always useful (Fourier transform) • Structure of a beam: F(k) Polarization • Propagation invariant beams

  5. Weber modes • Propagation invariant modes with parabolic cylinder symmetry

  6. Weber Modes

  7. Weber Modes • Propagation invariant • Fourier decomposition in a cone • Unusual gradients of the intensity • Dynamical variable Lz Py

  8. Weber modes

  9. Weber modes

  10. Weber modes

  11. Cold Atoms • Atom cooling • Atom trapping • Thermal atoms versus degenerate gases

  12. Atom Trapping

  13. Degenerate gases

  14. Trapping-cooling system J. Fortagh group, Univ. Tuebingen

  15. Absorption Imaging

  16. Atom-light interaction

  17. Experimental set-up 670 x420mm.

  18. Results:

  19. Results: Experiments vs Theory

  20. Results: Experiments vs Theory

  21. Evolution in phase space

  22. Evolution LzPy

  23. Theory vs experiment

  24. Conclusions • Weber beams as thermal cloud splitters • Direct numerical simmulation with no free parameters. • Observation of transfer of a different dynamical dynamical variable from light to matter.

  25. Scope • BEC: Experimental results Simulation

  26. BEC • Four quantum fluids • Two Gross-Pitaevskii • Two Bose distributions • Interaction ground-ground, ground-excited, excited-excited • Accurate description initial state • Evolution: classical fluid, relevance quantum pressure

  27. Some advances

  28. Preliminary theoretical results

  29. Simon Bernon Helge Hattermann Jószef Fortagh Carlos Luis Hernández Pedro Antonio Quinto Rocio Jáuregui

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