Group Servaas Kokkelmans

Group members:

Servaas Kokkelmans, s.kokkelmans [at], Principal Investigator. Here is a Short CV, and here a List of presentations.

Marcin Plodzien, Postdoc, personal website can be found here.

Tarun Johri, Ph.D student.

Rasmus Skannrup, Ph.D student.

Thomas Secker, Ph.D student.

Silvia Musolino, Ph.D student.

Ted van der Weerden, Master student.

Yuri van der Werf, Master student.

Paul Mestrom, Master student.

Bart Hoekstra, Master student.

Danielle Niestadt, Bachelor student.

Denise Braun, Bachelor student.

Peet Goedendorp, Bachelor student.

Robin Persoons, Bachelor student.

Aletta Meinsma, Bachelor student.

Ilian Plompen, Bachelor student.

Former group members:

Roonen Kroeze, Master student.

Vincent Debets, Bachelor student.

Tom Rademaker, undergraduate student.

Richard van Dongen, undergraduate student.

Cornee Ravensbergen, now Ph.D student at the Institute of Quantum Optics and Quantum Information, Innsbruck.

Rick van Bijnen, personal website, now Postdoc at the Max Planck Institute for the Physics of Complex Systems, Dresden.

Maikel Goosen, Ph.D student, now working at ASML in Veldhoven.

Sjoerd Smit, Master thesis student.

Marije Haverhals, Master thesis student

Jaron Sanders, Master thesis student, now postdoc in Sweden

Erik van der Wurff, undergraduate student, now Ph.D student at Utrecht University.

Nick Plantz, undergraduate student, now Ph.D student at Utrecht University.

Elmer Doggen, Master thesis student, now Postdoctoral Researcher at Université Paul Sabatier and CNRS

Jim Portegies, Master thesis student, now Postdoctoral researcher at the Max Planck Institute for Mathematics in the Sciences in Leipzig, Germany.

Bout Marcelis, Ph.D student, now researcher at Philips labs, Eindhoven

Johan Mentink, Master thesis student, now NWO-VENI fellow at the Radbout University in Nijmegen

Eric van Kempen, Ph.D student, now researcher at Philips labs, Eindhoven

Leon van Dijk, Master thesis student, now working at ASML in Veldhoven.

The former atomic physics theory group was headed by Prof. Verhaar (now retired).

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