Spin Superfluidity versus Solidity of Ultracold Polar Molecules

Details Spin Superfluidity versus Solidity of Ultracold Polar Molecules Spin Superfluidity versus Solidity of Ultracold Polar Molecules

2009-10-26

arxiv.org/abs/0910.4922v1

Physics

Condensed Matter

Quantum Gases

4 pages, 5 figures

Scientific paper

We present a technique for engineering quantum magnets via ultracold polar molecules in optical lattices and explore exotic interplay between its spin superfluidity and solidity. The molecular ground and first excited rotational states are resonantly coupled by a linearly polarized microwave field. The spin-up (spin-down) states are presented by molecular rotational states of electric dipole moment along (against) the coupling field. By controlling the angle between the lattice direction and the coupling field, the inter-site interaction can be tuned from antiferromagnetic to ferromagnetic. Furthermore, the dipole-dipole interaction induces an exotic interplay between spin superfluidity and solidity, and spin supersolid phases may appear in mediate regions.

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