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• W3217142489 abstract "Symmetry fractionalization (SF) on topological excitations is one of the most remarkable quantum phenomena in topological orders with symmetry, i.e., symmetry-enriched topological phases. While much progress has been theoretically and experimentally made in 2D, the understanding on SF in 3D is far from complete. A long-standing challenge is to understand SF on looplike topological excitations which are spatially extended objects. In this work, we construct a powerful topological-field-theoretical framework approach for 3D topological orders, which leads to a systematic characterization and classification of SF. For systems with Abelian gauge groups ($G_g$) and Abelian symmetry groups ($G_s$), we successfully establish equivalence classes that lead to a finite number of patterns of SF, although there are notoriously infinite number of Lagrangian-descriptions of the system. We compute topologically distinct types of fractional symmetry charges carried by particles. Then, for each type, we compute topologically distinct statistical phases of braiding processes among loop excitations and external symmetry fluxes. As a result, we are able to unambiguously list all physical observables for each pattern of SF. We present detailed calculations on many concrete examples. As an example, we find that the SF in an untwisted $mathbb{Z}_2times mathbb{Z}_2$ topological order with $mathbb{Z}_2$ symmetry is classified by $ (mathbb{Z}_2)^6oplus (mathbb{Z}_2)^2oplus (mathbb{Z}_2)^2oplus (mathbb{Z}_2)^2$. If the topological order is twisted, the classification reduces to $(mathbb{Z}_2)^6$ in which particle excitations always carry integer charge. Pure algebraic formalism of the classification is given by: $ bigoplus_{nu_i} mathcal H^4 ( G_gleftthreetimes_{nu_i}G_s, U (1)) /Gamma_omega ({nu_i}) ,$. Several future directions are proposed." @default.
• W3217142489 created "2021-12-06" @default.
• W3217142489 creator A5032088288 @default.
• W3217142489 creator A5041849777 @default.
• W3217142489 creator A5051905769 @default.
• W3217142489 date "2022-05-27" @default.
• W3217142489 modified "2023-10-17" @default.
• W3217142489 title "Fractionalizing global symmetry on looplike topological excitations" @default.
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