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arXiv 1908.10000cond-mat.str-el
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fPEPS计算中$\bar{n}_h$ =1/8掺杂时t-J模型中的稳定对角条纹

Stable diagonal stripes in the t-J model at $\bar{n}_h$=1/8 doping from fPEPS calculations

Shao-Jun Dong, Chao Wang, Yong-Jian Han, Chao Yang, Lixin He

摘要:

利用新近发展的高精度费米投影纠缠对态(fPEPS)方法研究了空穴掺杂为$\bar{n}_h$ =1/8时的二维t-J模型.利用随机梯度下降法结合蒙特卡罗抽样技术,我们得到了当$J/t$ =0.4时,基态空穴能量$E_{\rm hole}$ =-1.6186。我们发现基态具有稳定的对角线条纹而不是宽度为4个晶胞的垂直条纹,条纹填充$ρ_l$ =0.5。我们进一步表明,在这一点上的长程超导秩序被抑制。

英文摘要:

We investigate the 2D t-J model at a hole doping of $\bar{n}_h$=1/8 using recently developed high accuracy fermionic projected entangled pair states(fPEPS) method. By applying stochastic gradient descent method combined with Monte Carlo sampling technique, we obtain the ground state hole energy $E_{\rm hole}$=-1.6186 for $J/t$=0.4. We show that the ground state has stable diagonal stripes instead of vertical stripes with width of 4 unit cells, and stripe filling $ρ_l$=0.5. We further show that the long range superconductivity order is suppressed at this point.

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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