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arXiv 2403.01243cond-mat.str-el
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用费米子投影纠缠对态模拟手性自旋液体

Simulating chiral spin liquids with fermionic Projected Entangled Paired States

Sasank Budaraju, Didier Poilblanc, Sen Niu

AI总结:

本文利用变分蒙特卡罗方法研究了基于fPEPS的手性自旋液体,证明其能正确捕捉拓扑性质,且优化后的fPEPS在描述手性阻挫海森堡反铁磁体CSL相时避免了奇拓扑扇区中边缘模式的复制问题。

摘要:

本文在方格子上研究了基于自旋1/2的费米子投影纠缠对态(fPEPS)的手性自旋液体(CSL)。首先,通过变分蒙特卡罗(VMC)方法在有限尺寸环面上研究了Gutzwiller投影陈绝缘体(GPCI)的fPEPS近似。结果表明,这种有限键维度的fPEPS能够像精确的GPCI一样正确捕捉手性自旋液体的拓扑性质,并在环面上具有正确的拓扑基态简并度。此外,考虑了更一般的fPEPS,并在无限平面上进行优化,以描述手性阻挫海森堡反铁磁体的CSL相。在半无限长圆柱(有限周长)的边缘计算了手性模式,并表明其遵循共形场论的预测。与其玻色子类似物不同,(优化后的)fPEPS不会在奇拓扑扇区中出现手性边缘模式的复制现象。

英文摘要:

Chiral Spin Liquids (CSL) based on spin-1/2 fermionic Projected Entangled Pair States (fPEPS) are considered on the square lattice. First, fPEPS approximants of Gutzwiller-projected Chern insulators (GPCI) are investigated by Variational Monte Carlo (VMC) techniques on finite size tori. We show that such fPEPS of finite bond dimension can correctly capture the topological properties of the chiral spin liquid, as the exact GPCI, with the correct topological ground state degeneracy on the torus. Further, more general fPEPS are considered and optimized (on the infinite plane) to describe the CSL phase of a chiral frustrated Heisenberg antiferromagnet. The chiral modes are computed on the edge of a semi-infinite cylinder (of finite circumference) and shown to follow the predictions from Conformal Field Theory. In contrast to their bosonic analogs the (optimized) fPEPS do not suffer from the replication of the chiral edge mode in the odd topological sector.

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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