Absence of static stripes in the two-dimensional t-J model by an accurate and systematic quantum Monte Carlo approach

We examine the two-dimensional t−J model by using variational approach combined with well established quantum Monte Carlo techniques [S. Sorella et al., Phys. Rev. Lett. 88, 117002 (2002)] that are used to improve systematically the accuracy of the variational ansatz. Contrary to recent density-matrix renormalization group and projected entangled-pair state calculations [P. Corboz et al., Phys. Rev. B 84, 041108(R) (2011)], a uniform phase is found for J /t = 0.4, even when the calculation is biased with an ansatz that explicitly contains stripe order. Moreover, in the small hole doping regime, that is, δ 0.1, our results support the coexistence of antiferromagnetism and superconductivity.