Quantum Optics Group (LMU) - Quantum Many Body Systems Division (MPQ)

Professor Dan Stamper-Kurn has won a Humboldt Research Award

The award is conferred on established investigators from abroad to enable them to undertake collaborative projects with designated colleagues in Germany. Moreover, the Board of Directors of the Max Planck Institute of Quantum Optics has honoured Prof. Stamper-Kurn an MPQ Distinguished Scholar, in appreciation of his groundbreaking contributions to the field of Ultracold Quantum Gases and Quantum Optics. Prof. Stamper-Kurn arrived in Munich in January 2018, where he is pleased to be hosted by Prof. Immanuel Bloch. He is Professor at the University of California in Berkeley, he is also affiliated with the Materials Sciences Division at the Lawrence Berkeley National Laboratory and heads the Science Definition team of the Bose-Einstein Condensation Cold Atom Laboratory (BECCAL) – a collaborative endeavor of the German Aerospace Center (DLR) and NASA that aims to conduct quantum gas experiments aboard the International space Station (ISS).

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Professor Immanuel Bloch is elected member of the Bavarian Academy of Sciences

The Plenary Assembly of the Bavarian Academy of Sciences has appointed Professor Immanuel Bloch, Chair of Experimental Physics at Ludwig-Maximilians-Universität Munich and Director at the Max Planck Institute of Quantum Optics, an ordinary member.

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Thomas Kohlert received the Best Poster Prize at the 669. International WE-Heraeus-Seminar on Quantum Gases and Quantum Coherence.

The poster title is “Single-Particle Mobility Edge and Many-Body Localized Phase in a 1D Quasiperiodic Optical Lattice with Ultracold Atoms”.

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On Tuesday, March 6th 2018, Frauke Seeßelberg received the first price for her presentation at the EinsteinSlam.

EinsteinSlam is the competitive art of making complex science accessible to a broad audience. There are just 10 minutes for every attendee to present his/her self-made performance.

More information here: www.einstein-slam.de

A single-particle mobility edge (SPME) marks a critical energy separating extended from localized statesin a quantum system. In one-dimensional systems with uncorrelated disorder, a SPME cannot exist, since all single-particle states localize for arbitrarily weak disorder strengths. However, in a quasiperiodic system, the localization transition can occur at a finite detuning strength and SPMEs become possible. In this work, we find experimental evidence for the existence of such a SPME in a one-dimensional quasi-periodic optical lattice. Specifically, we find a regime where extended and localized single-particle states coexist, in good agreement with theoretical simulations, which predict a SPME in this regime.

Phys. Rev. Lett. 120, 160404 (2018)


Using fermionic ytterbium in a state-dependent optical lattice, we extend the capabilities of quantum simulators towards Kondo-type materials which exhibit spin-exchange interactions of mobile particles with localized magnetic impurities. The selective lattice potential only pins a fraction of the atoms, serving as immobile magnetic impurities. The emerging spin-exchange dynamics between the mobile atoms and impurities are directly observed, and in addition, an experimental tuning mechanism for the spin coupling is presented. This provides the framework for the future realization of a broad range of systems with spin impurity or two-orbital physics, including Kondo compounds, transition-metal oxides, heavy-fermion or colossal magnetoresistive materials.

Phys. Rev. Lett. 120, 143601 (2018) 

The quantum Hall effect - a prominent example for topological states of matter in 2D - can be generalized to 4D systems. In 4D, a novel quantized Hall response appears, which is nonlinear and described by a 4D topological invariant -  the second Chern number. We realize a dynamical version of the 4D quantum Hall effect by implementing a 2D topological charge pump for ultracold bosonic atoms in an angled optical superlattice. We observe a bulk response with intrinsic 4D topology and demonstrate its quantization by measuring the associated second Chern number.

Nature 553, 55 (2018)

Press release: English (.pdf), Deutsch (.pdf)