title: Competing states in the t-J model: uniform D-wave state versus stripe state.
abstract: Variational studies of the t-J model on the square lattice based on infinite projected-entangled pair states 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 antiphase 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.
authors.affiliation: Theoretische Physik, ETH Zurich, 8093 Zurich, Switzerland and Institute for Theoretical Physics, University of Amsterdam, Science Park 904, Postbus 94485, 1090 GL Amsterdam, Netherlands.
authors.forename: Philippe
authors.initials: P
authors.lastname: Corboz
authors.affiliation: Theoretische Physik, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: T M
authors.initials: TM
authors.lastname: Rice
authors.affiliation: Theoretische Physik, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: Matthias
authors.initials: M
authors.lastname: Troyer