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Seminar
Friday, February 12th, 2016 at 11:00
Room: D102 - Institut Galilée
Manuel Donaire
Laboratoire Kastler Brossel
Université Pierre et Marie Curie
4, place Jussieu
75005 PARIS - France

In this talk I will address several aspects of the Casimir-Polder (CP) and van der Waals (vdW) interactions which need a time-dependent treatment. To this aim, a diagrammatic approach will be developed.


In the first part of this talk I will show that, for an atom driven through Rabi oscillations under the action of Raman lasers, the CP interaction of the atom with a material surface may give rise to a renormalisation of the Rabi frequency [1]. Likewise, CP-induced Rabi oscillations may generate between two Zeeman sub-levels of a free atom in the vicinity of a reflecting surface [2].


Next, I will outline the computation of the vdW interaction between two non-identical atoms, one of which is prepared in an excited state. It is found that this interaction presents oscillations, both in time and in space [3]. Finally, I will discuss recent results on the quantum friction that an excited atom experiences as it moves at constant velocity parallel to a dilute atomic surface [4].


References
[1] ‘Coherent effect of vacuum fluctuations on driven atoms’, M. Donaire and A. Lambrecht, Phys. Rev. A92, 013838 (2015).
[2] ‘Casimir-Polder induced Rabi oscillations’, M. Donaire, M.-P. Gorza, A. Maury, R. Guérout and A. Lambrecht, EPL109 (2015) 24003.
[3] ‘Quasi-resonant van der Waals interaction between non-identical atoms’, M. Donaire, R. Guérout and A. Lambrecht, Phys. Rev. Lett. 115, 033201 (2015).
[4] ‘Velocity-dependent van der Waals force on an excited atom’, M. Donaire and A. Lambrecht, arXiv:1509.02573.

The coherent effect of atom-surface interactions on driven atoms and the dynamical effects of atom-atom interactions on excited atoms



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