Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.41: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Realization of a finite-size optical lattice for cold fermionic atoms — •Simon Murmann1, Andrea Bergschneider1, Vincent Klinkhamer1, Gerhard Zürn1, Thomas Lompe1,2, and Selim Jochim11Physikalisches Institut der Universität Heidelberg, INF 226, 69120 Heidelberg, Germany — 2Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA

We report on the realization of an experimental setup for the deterministic preparation of cold fermionic atoms in multiple-well potentials. Starting with a setup for the preparation of few-atom samples in the vibrational ground state of one tightly focused dipole trap, we expanded our experiment using an acousto-optic deflector (AOD) to split the trapping light into multiple orders forming one potential well each. Both depth and position of the individual wells can be changed independently, allowing the creation of a tunable finite-size optical lattice.

For two atoms in a double-well potential we report on the full control over the quantum state. Preparing the atoms in the ground state of the double-well potential, a finite interparticle interaction leads to a change in particle statistics. For strong repulsive (attractive) interactions we measure a strong enhancement (suppression) of singly occupied sites. In terms of a finite Fermi-Hubbard model this can be understood as a two-particle analogy to a Mott-insulator (charge-density wave). Adding more wells to the systems we aim for a bottom-up approach to Fermi-Hubbard physics. Further, prospects for experiments in dynamically changing potentials are presented.

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