{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/renormalized-classical-theory-of-quantum","title":"Renormalized Classical Theory of Quantum Magnets","arxiv_id":"2304.03874","date":"2023-04-08","proceeding":null,"authors":["David Dahlbom","Hao Zhang","Zoha Laraib","Daniel M. Pajerowski","Kipton Barros","Cristian Batista"],"abstract":"We derive a renormalized classical spin (RCS) theory for $S > 1/2$ quantum magnets by constraining a generalized classical theory that includes all multipolar fluctuations to a reduced CP$^1$ phase space of dipolar SU($2$) coherent states. When the spin Hamiltonian $\\hat{\\cal{H}}^{S}$ is linear in the spin operators $\\hat{\\boldsymbol{S}}_j$ for each lattice site $j$, the RCS Hamiltonian $\\tilde{\\cal{H}}_{\\rm cl}$ coincides with the usual classical model $\\cal{H}_{\\rm cl} = \\lim_{S\\rightarrow\\infty} \\hat{\\cal{H}}^S$. In the presence of non-linear terms, however, the RCS theory is more accurate than $\\cal{H}_{\\rm cl}$. For the many materials modeled by spin Hamiltonians with (non-linear) single-ion anisotropy terms, the use of the RCS theory is essential to accurately model phase diagrams and to extract the correct Hamiltonian parameters from neutron scattering data","url_abs":"https://arxiv.org/abs/2304.03874v3","url_pdf":"https://arxiv.org/pdf/2304.03874v3.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"renormalized-classical-theory-of-quantum","repo_url":"https://github.com/sunnysuite/sunny.jl","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}