Anomalous dynamical phase in quantum spin chains with long-range interactions

Understand

The existence or absence of non-analytic cusps in the Loschmidt-echo return rate is traditionally employed to distinguish between a regular dynamical phase (regular cusps) and a trivial phase (no cusps) in quantum spin chains after a global quench.

• However, numerical evidence in a recent study [J.
• C.
• Halimeh and V.