• DOI:10.1038/s41567-020-01081-3
• Corpus ID: 234065566

Ultrafast manipulation of the weakly bound helium dimer

@article{Kunitski2020UltrafastMO,
  title={Ultrafast manipulation of the weakly bound helium dimer},
  author={Maksim Kunitski and Qingze Guan and Holger Maschkiwitz and J{\"o}rg Hahnenbruch and Sebastian Eckart and Stefan Zeller and Anton Kalinin and Markus S. Sch{\"o}ffler and Lothar Ph. H. Schmidt and Till Jahnke and D{\"o}rte Blume and Reinhard D{\"o}rner},
  journal={Nature Physics},
  year={2020}
}

• M. Kunitski, Q. Guan, +9 authors R. Dörner
• Published 21 December 2020
• Physics
• Nature Physics

Controlling the interactions between atoms with external fields opened up new branches in physics ranging from strongly correlated atomic systems to ideal Bose1 and Fermi2 gases and Efimov physics3,4. Such control usually prepares samples that are stationary or evolve adiabatically in time. In contrast, in molecular physics, external ultrashort laser fields are used to create anisotropic potentials that launch ultrafast rotational wave packets and align molecules in free space5. Here we combine these two regimes of ultrafast times and low energies. We apply a short laser pulse to the helium dimer, a weakly bound and highly delocalized single bound state quantum system. The laser field locally tunes the interaction between two helium atoms, imparting an angular momentum of 2ℏ and evoking an initially confined dissociative wave packet. We record a video of the density and phase of this wave packet as it propagates from small to large internuclear distances. At large internuclear distances, where the interaction between atoms is negligible, the wave packet is essentially free. This work paves the way for future tomography of wave-packet dynamics and provides the technique for studying exotic and otherwise hardly accessible quantum systems, such as halo and Efimov states. Ultrashort laser fields applied to a helium dimer are able to tune the interactions between two helium atoms. A video of the dimer’s response to this localized disturbance shows the effect of dissociation and alignment of the wave packets.