Anisotropic Landau-Lifshitz model in discrete space-time
We construct an integrable lattice model of classical interacting spins in discrete space-time, representing a discrete-time analogue of the lattice Landau-Lifshitz ferromagnet with uniaxial anisotropy.As an application we use this explicit discrete symplectic integration scheme Pump to compute the spin Drude weight and diffusion constant as functi