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We study one-dimensional lattices of interacting spins-1/2 and show that theeffects of quenching the amplitude of a local magnetic field applied to asingle site of the lattice can be comparable to the effects of a globalperturbation applied instantaneously to the entire system. Both quenches takethe system to the chaotic domain, the energy distribution of the initial statesapproaches a Breit-Wigner shape, the fidelity (Loschmidt echo) decaysexponentially, and thermalization becomes viable.

Local quenches with global effects in interacting quantum systems