Scrambling-Enhanced Quantum Battery Charging in Black Hole Analogues

Black holes constitute nature's fastest quantum information scramblers, a phenomenon captured by gravitational analogue systems such as position-dependent XY spin chains. In these models, scrambling dynamics are governed exclusively by the hopping interactions profile, independent of system size. Utilizing such curved spacetime analogues as quantum batteries, how the black hole scrambling affects charging via controlled quenches of preset scrambling parameters is explored. This analysis reveals that the intentionally engineered difference between post-quench and pre-quench scrambling parameters can significantly enhance both maximum stored energy E_max and peak charging power P_max in the quench charging protocol. Furthermore, the peaks of extractable work and stored energy coincide. This is because the system's evolution under a weak perturbation remains close to the ground state, resulting in a passive state energy nearly identical to the ground state energy. The optimal charging time τ_* exhibits negligible dependence on the preset initial horizon parameter x_h0, while decreasing monotonically with increasing quench horizon parameter x_ht. This temporal compression confines high-power operation to regimes with strong post-quench scrambling x_ht > x_h0, demonstrating accelerated charging mediated by spacetime-mimicking scrambling dynamics.