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Strongly interacting spins underlie many intriguing phenomena andapplications ranging from magnetism to quantum information processing.Interacting spins combined with motion display exotic spin transport phenomena,such as superfluidity arising from pairing of spins induced by spin attraction.To understand these complex phenomena, an interacting spin system with highcontrollability is desired. Quantum spin dynamics have been studied ondifferent platforms with varying capabilities. Here we demonstrate tunableitinerant spin dynamics enabled by dipolar interactions using a gas ofpotassium-rubidium molecules confined to two-dimensional planes, where aspin-1/2 system is encoded into the molecular rotational levels. The dipolarinteraction gives rise to a shift of the rotational transition frequency and acollision-limited Ramsey contrast decay that emerges from the coupled spin andmotion. Both the Ising and spin exchange interactions are precisely tuned byvarying the strength and orientation of an electric field, as well as theinternal molecular state. This full tunability enables both static anddynamical control of the spin Hamiltonian, allowing reversal of the coherentspin dynamics. Our work establishes an interacting spin platform that allowsfor exploration of many-body spin dynamics and spin-motion physics utilizingthe strong, tunable dipolar interaction.

Tunable itinerant spin dynamics with polar molecules