Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Quantum Gases: Fermions I

Q 53.1: Talk

Thursday, March 3, 2016, 14:30–14:45, e001

Exploring a Strongly Interacting Fermi gas in a 2D lattice — •Luca Bayha, Ralf Klemt, Puneet Murthy, Mathias Neidig, Martin Ries, Gerhard Zürn, and Selim Jochim — Physikalisches Institut, Universität Heidelberg

In this talk we will present our current progress and ideas on exploring a two-component Fermi gas in the BEC-BCS crossover in a 2D square lattice.

Our starting point is a quasi-2D gas of deeply bound bosonic Li6 dimers, which are cooled to the superfluid phase. This sample is then loaded into a superimposed square lattice, where at shallow lattice depths we observe the appearance of additional peaks in the momentum distribution indicating superfluidity. For deeper lattices and low enough temperatures this system becomes insulating. By tuning the scattering length the type of this insulator can be smoothly changed from a band insulator of free fermions to a Mott insulator of repulsively interacting bosonic molecules. This change manifests itself in the different correlations between the particles, in both the spin and spatial degrees of freedom. These correlations can be accessed from atomic fluctuations in the momentum distribution. Thus we plan to investigate the (anti)correlations of atom shot-noise in the momentum distribution to reveal the character of the different insulating states.