Periodic driving of the SSH model with two unitaries produces end modes whose count can mismatch the winding number, while quasiperiodic protocols yield Loschmidt echoes that oscillate near one for long times before decaying as epsilon squared, and random protocols cause rapid decay.
The above arguments break down ifϵTis not very small or ifnis extremely large
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Su-Schrieffer-Heeger model driven by sequences of two unitaries: periodic, quasiperiodic, aperiodic, and random protocols
Periodic driving of the SSH model with two unitaries produces end modes whose count can mismatch the winding number, while quasiperiodic protocols yield Loschmidt echoes that oscillate near one for long times before decaying as epsilon squared, and random protocols cause rapid decay.