Local dynamics and the structure of chaotic eigenstates

Understand

We identify new universal properties of the energy eigenstates of chaotic systems with local interactions, which distinguish them both from integrable systems and from non-local chaotic systems.

• We study the relation between the energy eigenstates of the full system and products of energy eigenstates of two extensive subsystems, using a family of spin chains in (1+1) dimensions as an illustration.
• The magnitudes of the coefficients relating the two bases have a simple universal form as a function of $\omega$, the energy difference between the full system eigenstate and the product of eigenstates.
• This form explains the exponential decay with time of the probability for a product of eigenstates to return to itself during thermalization.