Ultrafast manipulation of the weakly bound helium dimer

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. Controlling the interactions between atoms with external fields opened up new branches in physics ranging from strongly correlated atomic systems to ideal Bose(1) and Fermi(2) gases and Efimov physics(3,4). 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 space(5). 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 2PLANCK CONSTANT OVER TWO PI 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.

Automated summary

The research explores the modulation of interactions between helium atoms in a helium dimer using ultrashort laser fields, demonstrating dissociation and alignment of wave packets. By controlling atomic interactions with external fields, new branches in physics are opened up and provide a technique for studying exotic and otherwise hardly accessible quantum systems.