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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster: Quantum Optics and Photonics I

Q 25.31: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik

Engineering exotic optical potentials for ultracold fermions — •Jeffrey Mohan, Samuel Häusler, Laura Corman, Philipp Fabritius, Martin Lebrat, Dominik Husmann, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich

We describe our experiment for studying transport phenomena in ultracold fermionic lithium through optically-defined mesoscopic structures. Using a digital micromirror device (DMD) as a spatial light modulator in conjunction with a high-resolution microscope, we can engineer additional potential landscapes that can go beyond what is feasible in corresponding solid-state systems. We have successfully applied this technique, for example, to imprint a lattice on the QPC whose gap was observed in the system’s transport characteristics [1], to implement a cold atom scanning gate microscope with a tightly-focused repulsive spot [2], and to insert a spin filter with a beam tuned in frequency between the two hyperfine states. With a recent improvement to our method of generating DMD patterns, we have improved the power efficiency of the potential projection by an order of magnitude and have significantly enhanced the fidelity of the resulting fields. With this new capability, we plan to investigate more complex structures such as time-varying fields, spin-dependent lattices, and spatially-engineered dissipation.
[1] Lebrat et al., Phys. Rev. X 8, 011053, 2018
[2] Häusler et al., Phys. Rev. Lett. 119, 030403, 2017