Antiferromagnetic Spin Correlation of SU (N ) Fermi Gas in an Optical Superlattice
Abstract
Large-spin cold atomic systems can exhibit unique phenomena that do not appear in spin-1 /2 systems. We report the observation of nearest-neighbor antiferromagnetic spin correlations of a Fermi gas with SU (N ) symmetry trapped in an optical lattice. The precise control of the spin degrees of freedom provided by an optical pumping technique enables us a straightforward comparison between the cases of SU(2) and SU(4). Our important finding is that the antiferromagnetic correlation is enhanced for the SU(4)-spin system compared with SU(2) as a consequence of a Pomeranchuk cooling effect. This work is an important step towards the realization of novel SU (N >2 ) quantum magnetism.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2018
- DOI:
- 10.1103/PhysRevLett.121.225303
- arXiv:
- arXiv:1801.05962
- Bibcode:
- 2018PhRvL.121v5303O
- Keywords:
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- Condensed Matter - Quantum Gases
- E-Print:
- 10 pages, 9 figures