Short-Range Quantum Magnetism of Ultracold Fermions in an Optical Lattice

Abstract

Fermionic Quantum Magnetism Optical lattices loaded with cold atoms have been used successfully as quantum simulators of condensed matter systems; however, in the case of fermionic quantum magnetism, achieving low enough temperatures has been a major obstacle. Greif et al. (p. 1307 , published online 23 May; see the Perspective by Porto ) selectively tuned the exchange interactions in an optical lattice of fermions, forcing a redistribution of entropy such that in the low-entropy subsystem the effective temperature was sufficiently low enough to lead to magnetic correlations.