  Variational studies of the t-J model on the square lattice based on infinite
projected-entangled pair states (iPEPS) confirm an extremely close competition
between a uniform d-wave superconducting state and different stripe states. The
site-centered stripe with an in-phase d-wave order has an equal or only
slightly lower energy than the stripe with anti-phase d-wave order. The optimal
stripe filling is not constant but increases with J/t. A nematic anisotropy
reduces the pairing amplitude and the energies of stripe phases are lowered
relative to the uniform state with increasing nematicity.
