Realizing a lattice spin model with polar molecules

Understand

With the recent production of polar molecules in the quantum regime, long-range dipolar interactions are expected to facilitate the understanding of strongly interacting many-body quantum systems and to realize lattice spin models for exploring quantum magnetism.

• In atomic systems, where interactions require wave function overlap, effective spin interactions on a lattice can be realized via superexchange; however, the coupling is weak and limited to nearest-neighbor interactions.
• In contrast, dipolar interactions exist in the absence of tunneling and extend beyond nearest neighbors.
• This allows coherent spin dynamics to persist even at high entropy and low lattice filling.