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Published on: March 30, 2017
Antiferromagnetic Spin Correlation of SU(N) Fermi Gas in an Optical Superlattice
Hideki Ozawa1, Shintaro Taie1, Yosuke Takasu1
1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
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.
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