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Stripes in the two-dimensional t-J model with infinite projected entangled-pair states

By Philippe Corboz, Steven R. White, Guifr´e Vidal and Matthias Troyer


We simulate the t-J model in two dimensions by means of infinite projected entangled-pair states (iPEPS) generalized to arbitrary unit cells, finding results similar to those previously obtained by the density-matrix renormalization group (DMRG) for wide ladders. In particular, we show that states exhibiting stripes, that is, a unidirectional modulation of hole-density and antiferromagnetic order with a π-phase shift between adjacent stripes, have a lower variational energy than uniform phases predicted by variational and fixed-node Monte Carlo simulations. For a fixed unit-cell size the energy per hole is minimized for a hole density ρ∼0.5 per unit length of a stripe. The superconducting order parameter is maximal around ρ∼0.75 - 0.8

Topics: Matrix Renormalization-Group, Lattice, Phase, 2504 Electronic, Optical and Magnetic Materials, 3104 Condensed Matter Physics
Publisher: American Physcial Society
Year: 2011
DOI identifier: 10.1103/PhysRevB.84.041108
OAI identifier:

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