Many-Body Localization in Spin Chain Systems with Quasiperiodic Fields

Abstract

We study the many-body localization of spin chain systems with quasiperiodic fields. We identify the lower bound for the critical disorder necessary to drive the transition between the thermal and many-body localized phase to be $W_{cl}\sim 1.85$, based on finite-size scaling of entanglement entropy and fluctuations of the bipartite magnetization. We also examine the time evolution of the entanglement entropy of an initial product state where we find power-law and logarithmic growth for the thermal and many-body localized phases, respectively. For larger disorder strength, both imbalance and spin glass order are preserved at long times, while spin glass order shows dependence on system size. Quasiperiodic fields have been applied in different experimental systems and our study finds that such fields are very efficient at driving the MBL phase transition.

6 pages, 6 figures

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