CQuIC Seminars
2D Superexchange-mediated magnetization dynamics in an optical lattice
Presented by Trey Porto, NIST/JQI
I will discuss recent experiments to study nonequilibrium magnetization dynamics in an extended 2D optical lattice. By loading effective spin-1/2 bosons into a spin-dependent optical lattice, we use the lattice to separately control the resonance conditions for both tunneling and superexchange. After preparing a nonequilibrium antiferromagnetically ordered state, we observe relaxation dynamics governed by two well- separated rates, which scale with the parameters associated with superexchange and tunneling. With tunneling off-resonantly suppressed, we realize superexchange-dominated dynamics over two orders of magnitude in magnetic coupling strength. A detailed theoretical description of this system is quite challenging, and our correlated many-body experiment goes beyond single-particle cold atom systems and can serve as a benchmark for theory.
3:30 pm, Thursday, October 1, 2015
PAIS-2540, PAIS
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