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Journal Article

Out-of-equilibrium phase diagram of long-range superconductors


Halimeh,  Jad C.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Uhrich, P., Defenu, N., Jafari, R., & Halimeh, J. C. (2020). Out-of-equilibrium phase diagram of long-range superconductors. Physical Review B, 101(24): 245148. doi:10.1103/PhysRevB.101.245148.

Cite as: https://hdl.handle.net/21.11116/0000-0007-31A2-A
Within the ultimate goal of classifying universality in quantum many-body dynamics, understanding the relation between out-of-equilibrium and equilibrium criticality is a crucial objective. Models with power-law interactions exhibit rich well-understood critical behavior in equilibrium, but the out-of-equilibrium picture has remained incomplete, despite recent experimental progress. We construct the rich dynamical phase diagram of free-fermionic chains with power-law hopping and pairing and provide analytic and numerical evidence showing a direct connection between nonanalyticities of the return rate and zero crossings of the string order parameter. Our results may explain the experimental observation of so-called accidental dynamical vortices, which appear for quenches within the same topological phase of the Haldane model, as reported by Flaschner et al. [Nat. Phys. 14, 265 (2018)]. Our work is readily applicable to modern ultracold-atom experiments, not least because state-of-the-art quantum gas microscopes can now reliably measure the string order parameter, which, as we show, can serve as an indicator of dynamical criticality.