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arXiv 1407.7773cond-mat.str-elquant-ph
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半离子共振价键态

Semionic resonating valence bond states

Mohsin Iqbal, Didier Poilblanc, Norbert Schuch

摘要:

戈薇海森堡反铁磁体(HAFM)的性质正在进行辩论。虽然最近的证据指向Z_2拓扑自旋液体,但拓扑相的确切性质仍不清楚。本文引入了半离子共振价键态(RVB),即处于Z_2有序双半离子相的共振价键态,并利用投影纠缠对态(PEPS)对它们进行了研究。我们研究了它们的物理性质,并研究了它们作为HAFM的替代物的适用性,与传统的RVB状态相比,它是在复曲面代码Z_2拓扑阶段。特别是,我们发现,一个适当优化的“半离子单形RVB”优于同样优化的传统的“单形RVB”状态,和纠缠谱(ES)的半离子RVB的行为非常不同的ES的传统RVB,这表明使用ES来区分这两个阶段。最后,我们还讨论了具有双半子拓扑序的价键波函数中空间群对称破缺的可能相关性。

英文摘要:

The nature of the kagome Heisenberg antiferromagnet (HAFM) is under ongoing debate. While recent evidence points towards a Z_2 topological spin liquid, the exact nature of the topological phase is still unclear. In this paper, we introduce semionic Resonating Valence Bond (RVB) states, this is, Resonating Valence Bond states which are in the Z_2 ordered double-semion phase, and study them using Projected Entangled Pair States (PEPS). We investigate their physics and study their suitability as an ansatz for the HAFM, as compared to a conventional RVB state which is in the Toric Code Z_2 topological phase. In particular, we find that a suitably optimized "semionic simplex RVB" outperforms the equally optimized conventional "simplex RVB" state, and that the entanglement spectrum (ES) of the semionic RVB behaves very differently from the ES of the conventional RVB, which suggests to use the ES to discriminate the two phases. Finally, we also discuss the possible relevance of space group symmetry breaking in valence bond wavefunctions with double-semion topological order.

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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