paper

Crystallography, Group Cohomology, and Lieb-Schultz-Mattis Constraints

arXiv:2410.03607 · doi:10.21468/SciPostPhys.18.5.161

Abstract

We present a computational study of the mod-2 cohomology of three-dimensional (3D) space groups, with an eye toward their applications in Lieb--Schultz--Mattis constraints. We prove finite-generation results for the cohomology of crystallographic groups and give ring presentations for for \emph{all} 230 3D space groups, together with explicit inhomogeneous representatives for the degree- cocycles used in the lattice applications. The all-degree interpretation of the ring presentations is organized through finite LHS-spectral-sequence and Hilbert-series verification checks. We then associate distinguished classes in to irreducible Wyckoff positions and use these classes as cohomological representatives of Lieb--Schultz--Mattis anomaly candidates when the on-site projective representations are classified by powers of . Finally, we apply the resulting anomaly data to quantum spin liquids on the 3D pyrochlore lattice and compare the symmetry-fractionalization constraints with projective-symmetry-group calculations.

arXiv commentv4: Minor mistakes fixed, full cochain representatives for all 230 space groups obtained

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