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Interacting quantum systems can exhibit dynamical localization, defying previous theories. Our study shows many-body localization in a quantum kicked rotor model with interacting bosons.

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Area of Science:

  • Quantum physics
  • Condensed matter theory
  • Atomic physics

Background:

  • The quantum kicked rotor is a key model for studying driven quantum systems.
  • Dynamical localization, a phenomenon analogous to Anderson localization, is observed in momentum space.
  • Interacting many-body systems were previously thought to disrupt this localization.

Purpose of the Study:

  • To investigate many-body dynamical localization in the Lieb-Liniger quantum kicked rotor.
  • To explore the behavior of interacting quantum-degenerate bosonic atoms in a driven system.

Main Methods:

  • Utilized the Lieb-Liniger model for interacting bosons.
  • Subjected the system to a pulsed sinusoidal potential (kicked rotor dynamics).
  • Analyzed the momentum distribution of the atoms after numerous kicks.

Main Results:

  • Observed many-body dynamical localization in the interacting quantum kicked rotor.
  • The momentum distribution of bosonic atoms ceased spreading after initial evolution.
  • Provided experimental evidence contradicting the assumption that interactions break localization.

Conclusions:

  • Demonstrated many-body dynamical localization in a realistic interacting quantum system.
  • The results highlight the complex interplay between interactions, driving, and quantum localization.
  • The findings contribute to understanding the transition from classical chaos to quantum behavior.