TIME REVERSAL SYMMETRY BREAKING IN CUPRATES INDUCED BY THE SPIRAL SPIN ORDER
Ovchinnikova M.Ya.

Received: November 1, 2002

PACS: 71.10.Fd, 74.20.Rp, 74.20.-z

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We propose a new interpretation of the spontaneous time reversal symmetry breaking (TRSB) observed recently in a pseudogap state of cuprates (Kaminsky et al.). It is shown that the TRSB dichroism in ARPES signal may be related to the local spin spiral structures in the system. It may be caused by a spin-orbit interaction and by spin polarization of electrons at various sections of the Fermi surface in the spiral state. The angular dependence of the dichroism signal is studied in a schematic KKR approximation. Tests are proposed to check the existence of the local spiral spin structure and to distinguish it from the TRSB state with micro-currents constructed by Varma.