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Dipolar interaction in ultra-cold atomic gases
C. Menotti, M. Lewenstein, T. Lahaye +1
Ultra-cold atomic systems provide a new setting where to investigate the role of long-range interactions. In this paper we will review the basics features of those physical systems…
Rydberg excitation of Bose-Einstein condensates
Rolf Heidemann, Ulrich Raitzsch, Vera Bendkowsky +3
Rydberg atoms provide a wide range of possibilities to tailor interactions in a quantum gas. Here we report on Rydberg excitation of Bose-Einstein condensed 87Rb atoms. The Rydberg…
Apparatus for excitation and detection of Rydberg atoms in quantum gases
Robert Loew, Ulrich Raitzsch, Rolf Heidemann +4
We present and characterize a versatile experimental setup which allows for excitation and detection of Rydberg atoms in quantum gases. The novel concept of the setup features two…
Strong dipolar effects in a quantum ferrofluid
Thierry Lahaye, Tobias Koch, Bernd Froehlich +5
We report on the realization of a Chromium Bose-Einstein condensate (BEC) with strong dipolar interaction. By using a Feshbach resonance, we reduce the usual isotropic contact inte…
A two-frequency acousto-optic modulator driver to improve the beam pointing stability during intensity ramps
B. Fröhlich, T. Lahaye, B. Kaltenhäuser +5
We report on a scheme to improve the pointing stability of the first order beam diffracted by an acousto-optic modulator (AOM). Due to thermal effects inside the crystal, the angul…
Evidence for coherent collective Rydberg excitation in the strong blockade regime
Rolf Heidemann, Ulrich Raitzsch, Vera Bendkowsky +4
Blockade effects on the single quantum level are at the heart of quantum devices like single-electron transistors. The blockade mechanisms are based on strong interactions like the…