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Formation and dynamics of anti-ferromagnetic correlations using ultracold fermions

Michael Messer, Daniel Greif, Gregor Jotzu +3 more

Bulletin of the American Physical SocietyJun 9, 20150 citations

Formation and dynamics of anti-ferromagnetic correlations of ultracold fermions in tunable lattices

Rémi Desbuquois, Daniel Greif, Gregor Jotzu +3 more

Bulletin of the American Physical SocietyMar 5, 20150 citations

Probing ferromagnetic order in few-fermion correlated spin-flip dynamics

G M Koutentakis, S I Mistakidis, P Schmelcher

Abstract We unravel the dynamical stability of a fully polarized one-dimensional ultracold few-fermion spin-1/2 gas subjected to inhomogeneous driving of the itinerant spins. Despite the unstable character of the total spin-polarization the existence of an interaction regime is demonstrated where the spin-correlations lead to almost maximally aligned spins throughout the dynamics. The resulting ferromagnetic order emerges from the build up of superpositions of states of maximal total spin. They comprise a decaying spin-polarization and a dynamical evolution towards an almost completely unpolarized NOON-like state. Via single-shot simulations we demonstrate that our theoretical predictions can be detected in state-of-the-art ultracold experiments.Abstract We unravel the dynamical stability of a fully polarized one-dimensional ultracold few-fermion spin-1/2 gas subjected to inhomogeneous driving of the itinerant spins. Despite the unstable character of the total spin-polarization the existence of an interaction regime is demonstrated where the spin-correlations lead to almost maximally aligned spins throughout the dynamics. The resulting ferromagnetic order emerges from the build up of superpositions of states of maximal total spin. They comprise a decaying spin-polarization and a dynamical evolution towards an almost completely unpolarized NOON-like state. Via single-shot simulations we demonstrate that our theoretical predictions can be detected in state-of-the-art ultracold experiments.

arXiv:1804.07199New Journal of PhysicsMar 29, 201929 citations

Exploring collective spin dynamics in a weakly interacting gas of fermions

Scott Smale, Andrew Koller, Ben A. Olsen +5 more

Bulletin of the American Physical SocietyJun 7, 20170 citations

Experimental Demonstration of Fermion Spin Correlations

Robert A. Close

Bulletin of the American Physical SocietyOct 19, 20120 citations

Ferromagnetic spin correlations in a few-fermion system

P. O. Bugnion, G. J. Conduit

We study the spin correlations of a few fermions in a quasi-one-dimensional trap. Exact diagonalization calculations demonstrate that repulsive interactions between the two species drives ferromagnetic correlations. The ejection probability of an atom provides an experimental probe of the spin correlations. With more than five atoms trapped, the system approaches the itinerant Stoner limit. Losses to Feshbach molecules are suppressed by the discretization of energy levels when fewer than seven atoms are trapped.We study the spin correlations of a few fermions in a quasi-one-dimensional trap. Exact diagonalization calculations demonstrate that repulsive interactions between the two species drives ferromagnetic correlations. The ejection probability of an atom provides an experimental probe of the spin correlations. With more than five atoms trapped, the system approaches the itinerant Stoner limit. Losses to Feshbach molecules are suppressed by the discretization of energy levels when fewer than seven atoms are trapped.

arXiv:1304.3299Physical Review AJun 28, 201351 citations

Probing ferromagnetism with few-fermion correlated spin-flip dynamics

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Probing ferromagnetism with few-fermion correlated spin-flip dynamics

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