@article{13142,
  keywords = {Multidisciplinary},
  author = {Jun-Ru Li and Kyle Matsuda and Calder Miller and Annette Carroll and William Tobias and Jacob Higgins and Jun Ye},
  title = {Tunable itinerant spin dynamics with polar molecules},
  abstract = {<p>Strongly interacting spins underlie many intriguing phenomena and applications1–4<br />
ranging from magnetism to quantum information processing. Interacting spins<br />
combined with motion show exotic spin transport phenomena, such as superfluidity<br />
arising from pairing of spins induced by spin attraction5,6. To understand these<br />
complex phenomena, an interacting spin system with high controllability is desired.<br />
Quantum spin dynamics have been studied on different platforms with varying<br />
capabilities7–13. Here we demonstrate tunable itinerant spin dynamics enabled by<br />
dipolar interactions using a gas of potassium-rubidium molecules confined to<br />
two-dimensional planes, where a spin-1/2 system is encoded into the molecular<br />
rotational levels. The dipolar interaction gives rise to a shift of the rotational<br />
transition frequency and a collision-limited Ramsey contrast decay that emerges from<br />
the coupled spin and motion. Both the Ising and spin-exchange interactions are<br />
precisely tuned by varying the strength and orientation of an electric field, as well as<br />
the internal molecular state. This full tunability enables both static and dynamical<br />
control of the spin Hamiltonian, allowing reversal of the coherent spin dynamics.<br />
Our work establishes an interacting spin platform that allows for exploration of<br />
many-body spin dynamics and spin-motion physics using the strong, tunable dipolar<br />
interaction.</p>
},
  year = {2023},
  journal = {Nature},
  volume = {614},
  pages = {70-74},
  month = {2023-02},
  publisher = {Springer Science and Business Media LLC},
  issn = {0028-0836, 1476-4687},
  url = {https://www.nature.com/articles/s41586-022-05479-2},
  doi = {10.1038/s41586-022-05479-2},
}