Exact spin helix eigenstates in anisotropic spin-$s$ Heisenberg model in arbitrary dimensions

Abstract: Spin-helix states are exact eigenstates of the spin-$1/2$ XXZ Heisenberg chain characterized by spatially modulated spin textures appearing under special parameter conditions. In this work, we generalize this framework and construct exact spin helix eigenstates in the fully anisotropic XYZ Heisenberg model, extending to higher spatial dimensions and spin representations, which reveals new stabilization mechanisms beyond integrability. The XXZ and XY limits are also analyzed to clarify the properties and constraints of these spin helix eigenstates. Our results broaden the class of analytically tractable exact eigenstates in quantum spin systems and deepen understanding of spatially inhomogeneous states in complex many-body systems.