Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Ultracold Atoms: Trapping and Cooling 1 (with Q)

A 23.3: Vortrag

Donnerstag, 17. März 2011, 15:00–15:15, SCH A118

EIT cooling of an atom in optical resonators — •Marc Bienert and Giovanna Morigi — Theoretische Quantenphysik, Universität des Saarlandes, 66041 Saarbrücken, Germany

We consider a single, harmonically trapped atom in an optical resonator. The internal level configuration of the atom is Λ-shaped. One of the dipole transitions is coupled to a strong laser field, whereas the other transition interacts with the quantised light field of the optical resonator. The resonator is additionally pumped by a weak probe laser. Similar configurations have been used recently to demonstrate electromagnetically induced transparency of a single atom [1]. We investigate the mechanical effects of the radiation acting on the atomic motional degree of freedom. The analysis is performed in the Lamb-Dicke limit. We investigate several cooling mechanisms occurring in this configuration, among them an analog to EIT cooling in free space and cavity sideband cooling. Further cooling schemes which rely on quantum interference can be identified. Finally, we compare our findings with experimental results which show alternating cooling and heating areas around two-photon resonance [2].

[1] M. Mücke et al., Nature 465, 755 (2010)

[2] T. Kampschulte et al., Phys. Rev. Lett. 105, 153603 (2010)