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Two recent quantum oscillation studies find contradictory results concerningthe existence of spin zeros - zeros of the oscillatory signal induced by Zeemansplitting of the Landau levels. We discuss these experiments in light ofcalculations of the oscillations assuming a spin density wave state. We findthat the lack of spin zeros reported in one of the experiments is consistentwith either hole or electron pockets in such a state, if the staggered momentis perpendicular to the external field. An analysis for field directions nearthe planes might be able to differentiate between the two. On the other hand,if spin zeros exist as reported in the other experiment, then the staggeredmoment would have to have a substantial longitudinal component. We suggestseveral experiments to test whether this is indeed the case.

Spin Zeros and the Origin of Fermi Surface Reconstruction in the Cuprates