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arXiv 1104.5463cond-mat.str-elcond-mat.supr-con
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二维t-J模型中的条纹

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

P. Corboz, S. R. White, G. Vidal, M. Troyer

摘要:

我们模拟的$t$ $J$模型在二维的无限投影纠缠对状态(iPEPS)推广到任意的单元格,发现类似的结果,以前所获得的密度矩阵重整化群(DMRG)的宽梯。特别是,我们表明,国家展示条纹,{ \it即}。空穴密度和反铁磁序的单向调制,相邻条纹之间具有$π$相移,具有比通过变分和固定节点蒙特卡罗模拟预测的均匀相更低的变分能量。对于固定的晶胞尺寸,对于每单位长度的条带的空穴密度$ρ_l\sim 0.5$,每空穴的能量最小化。超导序参量在$ρ_l\sim 0.75-0.8$附近最大。

英文摘要:

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, {\it i.e}. 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 $ρ_l\sim 0.5$ per unit length of a stripe. The superconducting order parameter is maximal around $ρ_l\sim 0.75-0.8$.

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