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Observation of many-body dynamical localization
Yanliang Guo1, Sudipta Dhar1, Ang Yang2
1Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, Innsbruck, Austria.
Science (New York, N.Y.)
|August 14, 2025
Summary
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.
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.
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