The variable-range SYK2 spectral form factor is essentially unchanged for alpha < 1/2, then develops a higher dip and a secondary plateau that trace the single-particle ergodic-to-non-ergodic transition.
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Many-body spectral transitions through the lens of the variable-range SYK2 model
The variable-range SYK2 spectral form factor is essentially unchanged for alpha < 1/2, then develops a higher dip and a secondary plateau that trace the single-particle ergodic-to-non-ergodic transition.