Tunable momentum pair creation of spin excitations in dipolar bilayers

We study the temporal growth and spatial propagation of quantum correlations in a two-dimensional bilayer realizing a spin-1/2 quantum XXZ model with couplings mediated by long-range and anisotropic dipolar interactions. Starting with an initial state consisting of spins with opposite magnetization in each of the layers, we predict a dynamic instability that results, at short times, in the creation of correlated pairs of excitations at specific momenta at exponentially fast rates and entanglement between spatially separated modes. The momentum structure of the created pairs can be controlled via the dipolar orientation, the layer separation, or the dipolar couplings. The predicted behavior remains observable at very low filling fractions, making it accessible in state-of-the-art experiments with Rydberg atoms, magnetic atoms, and polar molecule arrays.

Automated summary

We investigate the growth and propagation of quantum correlations in a two-dimensional bilayer system, where spins interact through long-range and anisotropic dipolar interactions. The study predicts the creation of correlated excitations at specific momenta and entanglement between spatially separated modes. The behavior can be controlled by changing the dipolar orientation, the layer separation, or the dipolar couplings, and can be observed in experiments with Rydberg atoms, magnetic atoms, and polar molecule arrays.