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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.68: Poster

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

The quasi-particle residue in the crossover from few to many particles — •Michael Dehabe, Andrea Bergschneider, Simon Murmann, Vincent M. Klinkhamer, Jan-Hendrik Becher, Gerhard Zürn, and Selim Jochim — Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany

In one dimension, the ground-state wave function of an impurity particle interacting with a Fermi sea is orthogonal to the ground-state wave function in the non-interacting case. Hence, the squared overlap of these two wave functions, which is known as quasi-particle residue, is zero.

By measuring the quasi-particle residue of a single impurity atom and an increasing number of majority atoms we want to study the emergence of orthogonality in the system. We deterministically prepare these few-fermion systems in a cigar-shaped optical dipole trap in their motional ground state. This system can be considered as quasi one-dimensional, if the atom number is smaller than the aspect ratio of the trap. For each specific number of majority particles, we determine the quasi-particle residue by flipping the spin of the impurity particle using a resonant RF pulse and measuring the Rabi frequency.

In our current experimental setup, the aspect ratio limits the number of majority particles to values smaller than five. We will present our latest results on increasing the aspect ratio of the trap while keeping full control over the quantum state of the few-atom system. This will allow us to study the quasi-particle residue in the crossover to the many-body limit.