Mainz 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.16: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

An experiment to initialize and study the Fermi-Hubbard model atom by atom — •Phillip Wieburg, Kai Morgener, 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 and allows studying the fundamental processes governing the Fermi-Hubbard model in a bottom-up approach.

Here we report upon the commissioning 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. We have already lasercooled 39K and 40K atoms and trapped them magnetically. Further cooling of the atoms will be performed using Raman-sideband cooling [1,2]. In order to image and to manipulate the atoms with high spatial resolution, our setup is equipped with a novel type achromatic imaging system located inside the vacuum chamber.

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

[2] L. W. Cheuk et al., Phys. Rev. Lett. 114, 193001 (2015).