2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22618The standard definition of a spin current, applied to the conductors lacking inversion symmetry, results in nonzero spin currents. I demonstrate that the spin currents do not vanish even in the thermodynamic equilibrium, in the absence of external fields. These currents are dissipationless and are not associated with a real spin transport. The result should be taken as a warning indicating problems inherent in the theory of transport spin currents driven by external fields.3 pagesMesoscale and Nanoscale Physicstext