Phantom energy in the nonlinear response of a quantum many-body scar state

K. Yang, Y. Zhang, K.-Y. Li, K. -Y. Lin, S. Gopalakrishnan, M. Rigol, and B. L. Lev
Phantom energy in the nonlinear response of a quantum many-body scar state
Science 385, 1063 (2024)
arXiv:2308.11615