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Group News

New Lecture: Selected Topics in Modern Condensed-Matter Theory

During the winter term 2016/2017, our group will host a lecture on selected topics in condensed-matter physics. Over the past few years, research in this field has witnessed several novel developments, which are revolutionizing our understanding of many-body systems. Among those developments are

  • the simulation of many-body problems in ultracold atomic-gas systems;
  • quantum phase transitions as a means for realizing exotic states of matter;
  • topological aspects of Hilbert spaces.

The course will discuss these developments and provide some of the necessary theoretical techniques.

Specific topics are:

  • Feynman diagram technique;
  • the method of slave fields for strong interactions;
  • phase transitions, critical phenomena, renormalization group method;
  • topological structure of the Hilbert space and consequences for the properties condensed-matter systems. Topological insulators.



OSCAR taking off!

Since 1 July 2016, the DFG collaborative research center OSCAR, Open System Control of Atomic and photonic matter with Reservoirs, is up and running. Groups from U Bonn and TU Kaiserslautern are collaborating within this CRC. Our group contributes two projects.


Research area B: Control of quantum many-body systems by environments.
Our group contributes to this area by developing the theory for understanding the dynamics of Bose-Einstein condensates with complex interactions, like photon condensates investigated experimentally in Martin Weitz' group.  The main theoretical tool is non-equilibrium Keldysh quantum field theory.





Research area C: Topological states in atomic and photonic systems.
The main focus lies on the development of basic tools and methods to create topological order in atomic and photonic matter as an alternative approach to control and protect quantum states. We investigate the topological stabilization of transport in Floquet-topological systems, where topological order is induced by time-periodic driving. Floquet-topological states are investigated experimentally in Dieter Meschede's group, using quantum walk techniques.


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