Symplectic integrators for classical spin systems

Abstract

We suggest a numerical integration procedure for solving the equations of motion of certain classical spin systems which preserves the underlying symplectic structure of the phase space. Such symplectic integrators have been successfully utilized for other Hamiltonian systems, e. g. for molecular dynamics or non-linear wave equations. Our procedure rests on a decomposition of the spin Hamiltonian into a sum of two completely integrable Hamiltonians and on the corresponding Lie-Trotter decomposition of the time evolution operator. In order to make this method widely applicable we provide a large class of integrable spin systems whose time evolution consists of a sequence of rotations about fixed axes. We test the proposed symplectic integrator for small spin systems, including the model of a recently synthesized magnetic molecule, and compare the results for variants of different order.

References in corpus (6)

• Fast spin dynamics algorithms for classical spin systems
• Optimized Forest-Ruth- and Suzuki-like algorithms for integration of motion in many-body systems
• Algorithm for molecular dynamics simulations of spin liquids
• Classes of integrable spin systems
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• A High-Performance Implementation of Atomistic Spin Dynamics Simulations on x86 CPUs
• Surface effects on ferromagnetic resonance in magnetic nanocubes
• Prethermalization in periodically-driven nonreciprocal many-body spin systems
• Length scale dependent diffusion in the Anderson model at high temperatures