Instability toward formation of quasi-one-dimensional Fermi surface in two-dimensional t-J model

We show within the slave-boson mean field approximation that the two-dimens ional t-J model has an intrinsic instability toward forming a quasi-one-dim ensional (q-1d) Fermi surface. This q-1d state competes with, and is overco me by, the d-wave pairing state for a realistic parameter choice. However, we find that a small spatial anisotropy in t and J exposes the q-1d instabi lity which has been hidden behind the d-wave pairing state, and brings abou t the coexistence with the d-wave pairing. We argue that this coexistence c an be realized in La2-x,SrxCuO4 systems.