Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Gases (Bosons and Fermions) II

Q 60.3: Talk

Friday, March 15, 2019, 11:15–11:30, S HS 037 Informatik

Doping-induced Ferromagnetism in quantum gases — •Luca Bayha, Marvin Holten, Keerthan Subramanian, Philipp Preiss, and Selim Jochim — Physics Institute, Heidelberg University, Germany

The emergence of collective behaviour in strongly correlated systems is still not fully understood. This is also the case even if the underlying microscopic Hamiltonian is as simple as in the Fermi-Hubbard model. One specific question is the microscopic origin of Ferromagnetism in itinerant spin systems. Especially intriguing is the discovery of Nagaoka, who calculated that doping the Hubbard model with a single hole away from half filling completely destroys antiferromagnetic ordering and leads to a ferromagnetic ground state for sufficiently large interactions. In our group we want to experimentally tackle this problem by preparing a minimal instance of this system. In this talk I will present our recent progress on deterministically preparing the ground state of a plaquette filled with three Fermions. We use a high resolution objective in combination with a Spatial Light Modulator (SLM) placed in the Fourier plane of the objective to project arbitrary potentials onto the atoms. To probe the system we plan to use the spin and position resolved imaging for single atoms. With only a few florescence photons collected on an EMCCD camera, the scheme does not require cooling and additionally gives access to the momentum space distribution.For the future we plan to merge these minimal instances and study larger systems of strongly correlated matter.