Abstract
We consider a model of a coexistence phase between superconductivity(SC) and spin-density wave(SDW) where the SC is assumed to be of dx2−y2+idxy(d1+id2) symmetry and the SDW order parameter is of s-wave as well as dxy symmetry. The Hamiltonian having such a symmetry is shown to yield a novel topological coexistence phase in addition to the conventional one. It is shown that the amplitudes of both the order parameters determine a new phase diagram characterizing different topological phases. A possible experimental realization of such topological phases in a recent ARPES data of high Tc superconductors in the extreme underdoped regime is analyzed by considering the effective order parameter to be a combination of dx2−y2 SC and dxy SDW.
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