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Suppression of Heating in Quantum Spin Clusters under Periodic Driving as a Dynamic Localization Effect
Kai Ji1,2, Boris V Fine1,3
1Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow Region, Russia.
Abstract:
We investigate numerically and analytically the heating process in ergodic clusters of interacting spins 1/2 subjected to periodic pulses of an external magnetic field. Our findings indicate that there is a threshold for the pulse strength below which the heating is suppressed. This threshold decreases with the increase of the cluster size, approaching zero in the thermodynamic limit, yet it should be observable in clusters with fairly large Hilbert spaces. We obtain the above threshold quantitatively as a condition for the breakdown of the golden rule in the second-order perturbation theory. It is caused by the phenomenon of dynamic localization.
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