Superdiffusive to Ballistic Transports in Nonintegrable Rydberg Chains

TL;DR

This paper reveals that in strongly interacting nonintegrable Rydberg chains, energy transport can transition from superdiffusive to ballistic, challenging the conventional diffusive paradigm at high temperatures.

Contribution

It demonstrates a superdiffusive to ballistic transport transition in a nonintegrable Rydberg model under strong interactions, revealing a new dynamical universality class.

Findings

Energy transport is superdiffusive with an exponent 3/4 at infinite temperature.

A transition from superdiffusion to ballistic transport occurs at a critical field ratio.

Results are applicable at large but finite interactions and temperatures under specific conditions.

Abstract

A common wisdom posits that transports of conserved quantities across clean nonintegrable quantum systems at high temperatures are diffusive when probed from the emergent hydrodynamic regime. We show that this empirical paradigm may alter if the strong interaction limit is taken. Using Krylov-typicality and purification matrix-product-state methods, we establish the following observations for the strongly interacting version of the mixed-field Ising chain, a nonintegrable lattice model imitating the experimental Rydberg blockade array. Given the strict projection owing to the infinite density-density repulsion $V$, the chain's energy transport in the presence of a transverse field $g$ is superdiffusive at infinite temperature featured by an anomalous scaling exponent $\frac{3}{4}$, indicating the existence of a novel dynamical universality class. Imposing, in addition, a growing longitudinal field $h$ causes a drastic factorization of the whole Hilbert space into smaller subsectors, evidenced by the spectral parsing of the eigenstate entanglement. Being a consequence of this approximate symmetry, a superdiffusion-to-ballistic transport transition arises at $h\approx g$. Interestingly, all the above results persist for large but finite interactions and temperatures, provided that the strongly interacting condition $g,h\ll k_\textrm{B}T\ll V$ is fulfilled. Our predictions are verifiable by current experimental facilities.