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Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 6: Quantum Gases: Bosons I

Q 6.6: Talk

Monday, March 6, 2017, 15:45–16:00, P 204

Measuring the Edwards-Anderson parameter in a disordered Bose-Hubbard model — •Antonio Rubio-Abadal1, Jae-yoon Choi1, Johannes Zeiher1, Simon Hollerith1, Sebastian Hild1, Immanuel Bloch1,2, and Christian Gross11Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany — 2Fakultät für Physik, Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 München, Germany

Quantum gas microscopes provide exciting perspectives to study disordered systems, since short-range-correlated disorder potentials can be generated, and microscopic observables probed with single-site resolution. A recent theory study [1] points out that such a setup could be used to probe the disordered Bose-Hubbard (BH) model by measuring an analogue of the Edwards-Anderson (EA) parameter, a commonly adopted "order parameter" in the context of spin glasses. Here we report on the direct measurement of the analogue EA parameter in disordered BH systems. We find a non-vanishing value in between the Mott lobes, indicating the presence of a Bose glass. These regions grow with disorder strength as expected. Our measurements provide a chemical-potential-resolved characterization of the phase diagram of the disordered BH model.

[1] S.J. Thomson et al. Phys. Rev. A 94, 051601(R) (2016)

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