Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.80: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Using Raman sideband cooling to build Fermi-Hubbard systems atom by atom — •Phillip Wieburg, Christian Darsow-Fromm, Lennart Sobirey, Thomas Lompe, and Henning Moritz — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Investigating the Fermi-Hubbard model with cold atoms is typically done by evaporatively cooling an ultracold Fermi gas and loading it into a large optical lattice. In contrast, we plan to build up a Fermi-Hubbard system site by site using optical microtraps. Each microtrap will contain a single atom cooled to the vibrational ground state by Raman-sideband cooling. This technique combines fast experimental cycle times with single site addressability and detection, which allows to study the fundamental processes governing the Fermi-Hubbard model in a bottom-up approach.

Here we present the design of this new experiment, which is going to be able to cool a gas of 40K to quantum degeneracy as well as to directly lasercool single atoms into optical microtraps. To achieve loading of single atoms with high fidelity, we can exploit light-assisted collisions as described in [1]. The cooling of the atoms will be performed using a Raman-sideband cooling techniques similar to the one described in [2]. In order to image and to manipulate the atoms with high spatial resolution, our setup will be equipped with a novel achromatic imaging system located inside the vacuum chamber.

[1] T. Grünzweig et al., Nature Physics 6 951 (2010).

[2] A.M. Kaufman et al., Physical Review X 2 041014 (2012).