Journal
PHYSICAL REVIEW B
Volume 84, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.041108
Keywords
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Funding
- Swiss National Science Foundation
- NSF [DMR-0907500]
- Direct For Mathematical & Physical Scien [907500] Funding Source: National Science Foundation
- Division Of Materials Research [907500] Funding Source: National Science Foundation
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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 p-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 rho(l) similar to 0.5 per unit length of a stripe. The superconducting order parameter is maximal around rho(l) similar to 0.75-0.8.
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