Mean-field analysis of quantum oscillations, Fermi-surface topology, and magnetic breakdown in high-Tc cuprates

The recent confirmation of closed Fermi surface in the high-temperature cuprates via de Haas-van Alphen and Shubnikov-de Haas oscillations calls for a theoretical investigation of the origin of such oscillations. We study de Haas-van Alphen oscillations and magnetic breakdown in the context of ortho-II high-temperature cuprates to understand the origin of the multiple frequencies. We find that the magnetic breakdown is highly sensitive not only to the ortho-II potential but also to the Fermi-surface topology and is thus useful to distinguish between various theoretical proposals related to quantum oscillations.