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Enhanced many-body localization in a kinetically constrained model.

Karl Royen1, Suman Mondal1, Frank Pollmann2,3

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Kinetic constraints in closed quantum systems promote localization when disorder is present. This study shows how these constraints enhance many-body localization, offering new control over quantum dynamics.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Statistical mechanics

Background:

  • Investigating thermalization in closed quantum systems is crucial.
  • Kinetic constraints influence system dynamics and lead to metastable states.
  • Understanding these constraints is key to controlling quantum behaviors.

Purpose of the Study:

  • To examine the impact of a specific kinetic constraint on interacting hardcore bosons.
  • To explore how this constraint affects localization in the presence of disorder.
  • To analyze the interplay between kinetic constraints and many-body localization.

Main Methods:

  • Utilizing a model of interacting hardcore bosons with a kinetic constraint.
  • Introducing uncorrelated disorder to observe its effects on system dynamics.
  • Analyzing time evolution of density autocorrelations and eigenstates.
  • Identifying phase transitions to many-body localized states.

Main Results:

  • The system exhibits a strong tendency towards localization with added disorder.
  • Disorder induces long-lived dynamics, observable in density autocorrelations.
  • The kinetic constraint lowers the disorder threshold for a many-body localized phase transition.
  • Eigenstates show enhanced localization due to the kinetic constraint.

Conclusions:

  • Kinetic constraints significantly enhance localization in disordered quantum systems.
  • This work provides insights into controlling many-body localized phases.
  • The findings are relevant for understanding glassy dynamics and quantum thermalization.