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Confined Quasiparticle Dynamics in Long-Range Interacting Quantum Spin Chains

TitleConfined Quasiparticle Dynamics in Long-Range Interacting Quantum Spin Chains
Publication TypeJournal Article
Year of Publication2019
AuthorsF. Liu, R. Lundgren, P. Titum, G. Pagano, J. Zhang, C. Monroe, and
JournalPhys. Rev. Lett.
Date PublishedAPR 16
Type of ArticleArticle

We study the quasiparticle excitation and quench dynamics of the one-dimensional transverse-field Ising model with power-law (1/r(alpha)) interactions. We find that long-range interactions give rise to a confining potential, which couples pairs of domain walls (kinks) into bound quasiparticles, analogous to mesonic states in high-energy physics. We show that these quasiparticles have signatures in the dynamics of order parameters following a global quench, and the Fourier spectrum of these order parameters can be exploited as a direct probe of the masses of the confined quasiparticles. We introduce a two-kink model to qualitatively explain the phenomenon of long-range-interaction-induced confinement and to quantitatively predict the masses of the bound quasiparticles. Furthermore, we illustrate that these quasiparticle states can lead to slow thermalization of one-point observables for certain initial states. Our work is readily applicable to current trapped-ion experiments.