Interaction-disorder competition in a spin system evaluated through the Loschmidt Echo

Understand

The interplay between interactions and disorder in closed quantum many-body systems is relevant for thermalization phenomenon.

• In this article, we address this competition in an infinite temperature spin system, by means of the Loschmidt echo (LE), which is based on a time reversal procedure.
• This quantity has been formerly employed to connect quantum and classical chaos, and in the present many-body scenario we use it as a dynamical witness.
• We assess the LE time scales as a function of disorder and interaction strengths.