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Event details
  • Symposium
When Nov 22, 2016
from 10:00 to 18:00
Where Kaiserslautern, Rotunde
Contact Name M. Fleischhauer
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10:00                          Coffee

10:30  - 11:45             "Quantum Crystals of Matter and Light"

11:45  - 13:00            Lunch, Mensa

13:00  - 14:15            "Ultracold Fermions in Optical Lattices"

14:15  - 14:45            Coffee break

14:45  - 16:00           “Modern Aspects of Quantum Physics and Topology”

16:00  - 16:30            Coffee Break

16:30  - 18:00            work groups, places to be announced



Tobias Donner, Zurich      

 "Quantum Crystals of Matter and Light"

Coupling the external degree of freedom of a quantum gas to the light field inside an optical cavity induces global-range interactions between the atoms. These interactions can compete with other energy scales, leading to phase transitions between novel crystalline states of matter. The openness of the cavity thereby offers a natural access to investigate the many-body system in real-time.

We study a Bose-Einstein condensate (BEC) in an optical lattice with such cavity-mediated interactions, and observe phases like a lattice supersolid and an insulating charge density wave. In a different experiment, we couple a BEC simultaneously to two optical cavities. This allows us to enhance the underlying discrete spatial symmetry, resulting in a genuine supersolid with a broken continuous spatial symmetry. 


Michael Köhl, Bonn

"Ultracold Fermions in Optical Lattices"

The subtle interplay between kinetic energy, interactions, and dimensionality challenges our comprehension of strongly correlated physics observed, for example, in the solid state. In this quest, the Hubbard model has emerged as a conceptually simple, yet rich model describing such physics. Here we present an experimental determination of the equation of state of the repulsive two-dimensional Hubbard model over a broad range of interactions 0 < U/t < 20 and temperatures, down to kBT/t = 0.6 using high-resolution imaging of ultracold fermionic atoms in optical lattices. We show density profiles, compressibilities, double occupancies and anti-ferromagnetic correlations over the whole doping range, and, hence, our results constitute benchmarks for state-of-the-art theoretical approaches.


Miguel Martin Delgardo, Madrid  

“Modern Aspects of Quantum Physics and Topology”

The content will revolve around the modern applications of quantum topology to quantum information and condensed matter, with some comments about the ‘prehistory’ of these new developments.

I will use very general and conceptual ideas with little technical details in the first half or so. The main topics will be on what topology tries to solve in quantum information and what new quantum states of matter
are consequences of these applications, namely: topological orders and topological insulators/superconductors.

I will make emphasis in their similarities and differences. I will use plain words and basic/fundamental facts. I will introduce modern applications of thermal and noise effects on topological systems as an example.






Work Group Topics:

Digital light Modulators                               Moderator: Herwig Ott
Floquet theory for open systems                Moderator: James Anglin








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