Description
The study of quantum matter with extended volume restrictions has revealed intriguing dynamical properties. In our recent investigation, we discovered that the two-dimensional quantum hard disk model exhibits Hilbert space fragmentation and quantum many-body scars. This phenomenon results in non-thermal behavior in the dynamics for specific initial conditions. In this work, we extend this model by introducing next-to-nearest neighbor interactions. We find that although many quantum many-body scars are absent in the interacting case, some persist. Furthermore, initial states with high overlap with these scars still exhibit non-thermal behavior. Other configurations that showed non-thermal behavior in the interaction-free case display long plateaus before eventually thermalizing. We also present arguments suggesting that even extensive defects can maintain non-thermal behavior in the thermodynamic limit.
References
V. D. Naik, F. B. Trigueros, and M. Heyl, Quantum hard disks on a lattice (2024), arXiv:2311.16240
