Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.15: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Exploring few-fermion systems in single- and multi-well potentials — •Andrea Bergschneider, Simon Murmann, Vincent M. Klinkhamer, Gerhard Zürn, and Selim Jochim — Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

We study fermionic systems in the transition from microscopic to mesoscopic size. To do this, we start with the smallest realization that contains the relevant physics and then gradually increase the size of the system. Here, we present several experiments to investigate this cross-over and the methods we use.

We can deterministically prepare balanced and spin-polarized few-fermion systems in the ground state of a single well having full control over their quantum state. We can control the confinement of the potential and also create multiple wells. Furthermore, our system allows us to tune the interactions between the fermions over a large range. To probe it, we detect the number and spin of atoms in the potential wells site-selectively and measure the energy of the system.

With our setup, we study the physics of one impurity interacting with an increasing number of majority particles. It also allows us to prepare two fermions in the ground state of the double well and observe the occupation statistics as a function of the interaction strength.