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How order melts after quantum quenches

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Injecting a sufficiently large energy density into an isolated many-particle system prepared in a state with long-range order will lead to the melting of the order over time. Detailed information… Click to show full abstract

Injecting a sufficiently large energy density into an isolated many-particle system prepared in a state with long-range order will lead to the melting of the order over time. Detailed information about this process can be derived from the quantum mechanical probability distribution of the order parameter. We study this process for the paradigmatic case of the spin-1/2 Heisenberg XXZ chain. We determine the full quantum mechanical distribution function of the staggered subsystem magnetization as a function of time after a quantum quench from the classical Neel state. This provides a detailed picture of how the Neel order melts and reveals the existence of an interesting regime at intermediate times that is characterized by a very broad probability distribution.

Keywords: quantum quenches; order; order melts; distribution; melts quantum

Journal Title: Physical Review B
Year Published: 2020

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