SFB 652:  Strong Correlations and Collective Effects in Radiation Fields: Coulomb Systems, Clusters and Particles

• Subject Area: Physics
• Term: from 2005 to 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5486320

In the centre of this Collaborative Research Centre are recently developed technical and physical possibilities which enable to open up new phenomena of the interaction of light (or more generally: a radiation field) and matter. For the first time, in a coordinated research effort, the interplay between the radiation field and the solid state, in particular semiconductor quantum wells and dots, clusters and particles as well as Coulomb systems, will be comprehensively investigated. As radiation sources serve besides different optical laser systems - cw lasers, pulsed lasers from 20 femtoseconds (1 femtosec. = 0,000000000000001 sec.) to nanoseconds (1 nanosec. = 0,000000001 sec.) pulse width, and with extremely high power densities - also the Free Electron Laser (FEL) and the X-ray Free Electron Laser (X-FEL, both at the Hasylab/DESY in Hamburg).
If for example ultra-short laser light pulses hit on a semiconducting material, under suitable conditions electron hole ensembles are formed, which interact with the radiation field in a special way. That is the field of semiconductor quantum optics, in which possibilities for quantum computing or the production of novel quantum states (Bose Einstein condensation) are investigated. In the case of drastically stronger excitation with ultra-intense lasers the state of matter changes from the atomic structure into a dense electron-ion-system (dense Coulomb system). This state is well-known from the inside of the sun and from large planets. Finally the specific excitation of collective effects makes it possible to control the energy absorption from an intensive radiation field, which was demonstrated recently in an impressive way with clusters. The results of these experiments could lead to the development of new lasers.
Thus a characteristic feature in this cutting-edge research field is the presence of a radiation field, which initiates complex and on the microscopic scale connected, i.e. correlated and collective phenomena. On the other hand the radiation field can also be used to identify these correlations. The connection of aspects of correlations and of the radiation field is thus a universal concept of fundamental importance.

• DFG Programme: Collaborative Research Centres

Completed projects

• A01 - Matter exposed to EUV and Free-Electron-Laser radiation (Project Heads Meiwes-Broer, Karl-Heinz ;  Redmer, Ronald ;  Tiggesbäumker, Ph.D., Josef )
• A02 - Thomson scattering and correlations in warm dense matter (Project Head Redmer, Ronald )
• A03 - Correlated processes in size-selected stored clusters (Project Heads Marx, Gerrit ;  Meiwes-Broer, Karl-Heinz ;  Schweikhard, Lutz )
• A04 - Optical properties and dielectric response of strongly correlated Coulomb systems (Project Head Reinholz, Heidi E.M. )
• A05 - Controlled strong-field excitation of clusters and particles by shaped laser pulses (Project Heads Meiwes-Broer, Karl-Heinz ;  Tiggesbäumker, Ph.D., Josef )
• A06 - Absorption, ionization and control of dense Coulomb systems in laser fields (Project Heads Bornath, Thomas ;  Schlanges, Manfred )
• A07 - Phasenverhalten des Lichtes in optisch angeregten Halbleiterstrukturen (Project Heads Manzke, Günter ;  Stolz, Heinrich )
• A08 - Microscopic description of atomic clusters in intense laser fields (Project Head Fennel, Thomas )
• A09 - Density functional theoretical description and simulation of quantum dynamics in strong laser fields (Project Head Bauer, Dieter )
• A10 - How does the the local environment affect the dynamics of energy transfer in molecular aggregates? (Project Heads Barke, Ingo ;  Speller, Sylvia )
• A11 - Light induced interaction of nanoparticles and molecules on surfaces (Project Head Scheel, Stefan )
• B01 - Excitonic Bose-Einstein condensates in potential traps (Project Head Stolz, Heinrich )
• B02 - Nonclassical light from semiconductor microcavities and quantum wells (Project Heads Stolz, Heinrich ;  Vogel, Werner )
• B03 - Exzitonische cluster mit starker Kopplung in Lichtfelder (Project Heads Fehske, Holger ;  Stolz, Heinrich )
• B04 - Möglichkeit und Signaturen von BEC in strukturierten Elektron-Loch-Systemen (Project Head Henneberger, Klaus )
• B05 - Dynamics, quantum coherence and entanglement of strongly correlated excitonic systems (Project Head Fehske, Holger )
• B06 - Radiation-induced correlations in ultracold helium droplets (Project Head Meiwes-Broer, Karl-Heinz )
• B09 - Dynamics of correlated excitons in molecular aggregates (Project Head Lochbrunner, Stefan )
• B10 - Laser-Driven Multi-Exciton Dynamics in Molecular Aggregates (Project Head Kühn, Oliver )
• B11 - Dynamics of structural correlations in liquid Coulomb systems (Project Heads Kühn, Oliver ;  Lochbrunner, Stefan ;  Ludwig, Ralf )
• B12 - Quantum Correlations of Light and Matter: Quantification and Application (Project Head Vogel, Werner )
• B13 - Preparation, characterisation and application of quantum correlations in the radiation field (Project Head Hage, Boris )
• B14 - Nonequilibrium description of excitonic Bose-Einstein condensates in traps (Project Heads Fehske, Holger ;  Stolz, Heinrich )
• MGK - Integrated graduate school (Project Head Lochbrunner, Stefan )
• Z - Central services (Project Head Meiwes-Broer, Karl-Heinz )

• Applicant Institution: Universität Rostock
• Participating University: Universität Greifswald
• Spokesperson: Professor Dr. Karl-Heinz Meiwes-Broer