Theory of robust quantum many-body scars in long-range interacting systems

Understand

Quantum many-body scars (QMBS) are exceptional energy eigenstates of quantum many-body systems associated with violations of thermalization for special non-equilibrium initial states.

• Their various systematic constructions require fine-tuning of local Hamiltonian parameters.
• In this work we demonstrate that long-range interacting quantum spin systems generically host robust QMBS.
• We analyze spectral properties upon raising the power-law decay exponent $\alpha$ of spin-spin interactions from the solvable permutationally-symmetric limit $\alpha=0$.