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We discovered a minimal model exhibiting orthogonal quantum many-body scars, which show persistent oscillations and infinite lifetimes. This challenges the link between quantum ergodicity and entanglement generation in complex quantum systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Statistical Physics

Background:

  • Quantum many-body scars are atypical quantum states that defy the eigenstate thermalization hypothesis.
  • They manifest as long-lived oscillations in local observables during quench experiments, indicating quantum nonergodicity.
  • These scars are typically associated with subextensive entanglement entropy, used as a numerical diagnostic.

Purpose of the Study:

  • To construct a minimal model demonstrating orthogonal quantum many-body scars.
  • To investigate the relationship between quantum ergodicity and entanglement generation.
  • To explore novel nonequilibrium dynamics in strongly correlated quantum systems.

Main Methods:

  • Introduction of kinetic constraints into a fractionalized orthogonal metal.
  • Construction of a minimal model exhibiting orthogonal quantum many-body scars.
  • Analysis of quench dynamics and entanglement entropy generation.

Main Results:

  • A minimal model with orthogonal quantum many-body scars was successfully constructed.
  • These scars lead to persistent oscillations with theoretically infinite lifetimes.
  • The model exhibits rapid volume-law entanglement generation alongside these scar states.

Conclusions:

  • The study provides a new perspective on the interplay between quantum ergodicity and many-body entanglement.
  • The findings offer a unique platform for studying exotic nonequilibrium dynamics in multicomponent quantum systems.
  • This work challenges conventional understanding of thermalization in quantum many-body systems.