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arxiv: 2501.13095 · v2 · pith:4NM3HU3M · submitted 2025-01-22 · quant-ph · cond-mat.str-el· physics.comp-ph

Sunny.jl: A Julia Package for Spin Dynamics

David Dahlbom , Hao Zhang , Cole Miles , Sam Quinn , Alin Niraula , Bhushan Thipe , Matthew Wilson , Sakib Matin
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Het Mankad Steven Hahn Daniel Pajerowski Steve Johnston Zhentao Wang Harry Lane Ying Wai Li Xiaojian Bai Martin Mourigal Cristian D. Batista Kipton Barros
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classification quant-ph cond-mat.str-elphysics.comp-ph
keywords spinsunnybroaddynamicsjuliapackageapproachescalculating
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Sunny is a Julia package designed to serve the needs of the quantum magnetism community. It supports the specification of a very broad class of spin models and a diverse suite of numerical solvers. These include powerful methods for simulating spin dynamics both in and out of equilibrium. Uniquely, it features a broad generalization of classical and semiclassical approaches to SU(N) coherent states, which is useful for studying systems exhibiting strong spin-orbit coupling or local entanglement effects. Sunny also offers a well-developed framework for calculating the dynamical spin structure factor, enabling direct comparison with scattering experiments. Ease of use is a priority, with tools for symmetry-guided modeling and interactive visualization.

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