Quantum to classical crossover in many-body chaos and scrambling from relaxation in a glass

Surajit Bera, K. Y. Venkata Lokesh, Sumilan Banerjee

Chaotic quantum systems with Lyapunov exponent ${\lambda }_{\mathrm{L}}$ obey an upper bound ${\lambda }_{\mathrm{L}}\le 2\pi k_{\mathrm{B}}T/\hslash$ at temperature $T$, implying a divergence of the bound in…