Dynamics of an ultracold weakly bound heteronuclear diatomic molecule in an ultrashort laser pulse

We propose a theoretical model used for dynamically manipulating an ultracold weakly bound heteronuclear alkali-metal diatomic molecule by a nonresonant single-cycle THz laser pulse. Taking the ⁶Li²³Na molecule as an example, we first calculate the variation of the weakly bound state and quasibound state as a function of external electric field, and then reveal abundant interference patterns during and after the laser pulse due to the superpositions between states involving weakly bound state, scattering state, and quasibound state. Moreover, one can map out the nodes of the probability density of the weakly bound molecules by measuring the wavepacket dynamics.