Research interests:

  • Many-body properties of strongly interacting Fermi and Bose gases
  • Ultracold collisions and analytic properties of resonant interactions
  • Few-body physics
  • Strong interactions in optical lattices
  • Ultracold plasmas and Rydberg lattices


We participate in the International Cold Atom Network.
We are part of the POLATOM ESF Research Networking Programme.

We are part of the larger Atomic Physics and Quantum Electronics (CQT) group, at the Department of Physics, at Eindhoven University.
In the department we participate in the Network Theoretical Physics.
We also participate in the Dutch Research School of Theoretical Physics DRSTP.

Our research project From Rydberg atom to quantum bit is part of a FOM program, with is jointly operated with the Quantum gases and Quantum Information group at the University of Amsterdam.
Our Rydberg Quantum Simulator research is also funded by the Horizon 2020 European RySQ project.
Our research group Quantum gases with strong interactions was started up by an NWO-VIDI grant.

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Latest News:

Trapped electrons in the quantum degenerate regime

A full strength Coulomb interaction between trapped electrons can be felt only in absence of a neutralizing background. In order to study quantum degenerate electrons without such a background, an external trap is needed to compensate for the strong electronic repulsion. As a basic model for such a system, we study a trapped electron pair in a harmonic trap with an explicit inclusion of its Coulomb interaction. We find the eigenenergies of the system for any value of the trapping strength. The problem is solved either numerically or by using approximate methods. As function of the trapping strength a crossover can be made from the strongly to the weakly-coupled regime, and we show that in both regimes perturbative methods based on a pair-wise electron description would be effective for a many-particle trapped electron system.   arXiv:1508.00365

Stability of triplet rubidium ground-state molecules

Experiments involving ultracold molecules require sufficiently long lifetimes, which can be very short for excited rovibrational states in the molecular potentials. For alkali atoms such as rubidium, molecular, rovibrational ground-states can both be found in the electronic singlet and triplet configurations. The molecular singlet ground state is absolutely stable, however, the triplet ground state can decay to a deeper bound singlet molecule due to a radiative decay mechanism that involves the interatomic spin-orbit interaction. We investigate this mechanism, and find the lifetime of rubidium molecules in the triplet rovibrational ground-state to be about 13 minutes. This is sufficiently long for experimental purposes.   arXiv:1412.5799