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arXiv 1111.5158cond-mat.str-el
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用精确系统的量子蒙特卡罗方法研究二维$t{-}J$模型中静态条纹的缺失

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

Wen-Jun Hu, Federico Becca, Sandro Sorella

摘要:

我们用变分方法结合量子蒙特卡罗方法研究了二维$t{-}J$模型[S. Sorella { \it等},\prl { \bf 88},117002(2002)],其用于系统地提高变分分析的精度。与最近的密度矩阵重整化群和投影纠缠对状态计算相反[P. Corboz { \it et al.},\prb { \bf 84},041108(R)(2011)]中,即使当计算用显式包含条纹顺序的模来偏置时,也发现了$J/t=0.4$的均匀相位。此外,在小孔掺杂机制中,即,$δ\lesssim 0.1$,我们的结果支持反铁磁性和超导性共存。

英文摘要:

We examine the two-dimensional $t{-}J$ model by using variational approach combined with well established quantum Monte Carlo techniques [S. Sorella {\it et al.}, \prl {\bf 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 {\it et al.}, \prb {\bf 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, i.e., $δ\lesssim 0.1$, our results support the coexistence of antiferromagnetism and superconductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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