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Poster presented at the June 2026 AIM of the Department of Physics

The poster shows a selection of recent projects from our theory group. Some of them are done in close collaboration with our colleagues from experiment, which is at the very basis of research in empirical science such as physics. Many questions give rise to problems of computational complexity and are to a different degree related with analytical approximations. Most of our themes involve many bosons, typically quantum gases at ultralow temperatures, where Bose-Einstein condensation can occur.

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Dynamics of ultracold atomic quantum gases - Non-equilibrium quantum field theory

(Recent publications)

Present and recently covered research topics:
- Dynamics of ultracold atomic quantum gases far from thermal equilibrium: single-component, spinor gases and beyond.
- Dipolar quantum gases: phase-ordering, supersolids, quench dynamics.
- Universal dynamics; non-thermal fixed points; strong wave turbulence.
- Quantum and superfluid turbulence.
- Numerical approaches: Truncated-Wigner simulations; Complex-Langevin method.
- Functional QFT approaches: functional Renormalisation group; 2PI effective action.
- Exactly solvable models: (Matrix) Lieb-Liniger models.
Past research topics:
- Dynamical formation of non-classical states. Squeezing and entanglement.
- Equilibration dynamics; generalized Gibbs ensemble.
- Exactly solvable models: Lieb-Liniger model; transverse-field Ising model.
- Fermionic transport in Kondo-type strongly correlated systems.
- Ultracold quantum gases in lattice trapping potentials.
- Molecule formation in Bose-Einstein condensates.
We are a member of the Excellence Cluster STRUCTURES as well as of the Collaborative Research Center ISOQUANT at Heidelberg University.
Artificial neural networks for quantum physics - Neuromorphic quantum systems

(Publications)

Past research topics:
- Spiking neuromorphic chips for encoding entangled quantum states.
- Quench dynamics of neural quantum states.
- Artificial neural networks.
Discrete symmetries in atomic physics

(Publications)

Research interests (presently no activities):
- Parity violation in hydrogen-like atoms.
- Geometric (Berry) phases in open systems.

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