I will discuss recent experiments to study nonequilibrium
magnetization dynamics in an extended two-dimensional (2D) optical
lattice. With effectively spin-1/2 bosons loaded into a
spin-dependent checkerboard lattice, we use the lattice to
separately control the resonance conditions for 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 observe
superexchange-dominated dynamics over two orders of magnitude in
magnetic coupling strength. Our experiment serves as a benchmark for
theoretical work as the detailed dynamics of this 2D, strongly
correlated, and far-from-equilibrium quantum system remain out of
reach of current computational techniques.