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arXiv 1407.6985cond-mat.str-el
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ν=1/3分数阶Chern绝缘体的特征和稳定性

Characterization and stability of a fermionic ν=1/3 fractional Chern insulator

Adolfo G. Grushin, Johannes Motruk, Michael P. Zaletel, Frank Pollmann

摘要:

利用无限圆柱几何上的无限密度矩阵重整化群方法,我们在Haldron蜂窝晶格模型中刻画了$ν=1/3$填充最低能带时的$1/3$分数Chern绝缘体态,并检验了它的稳定性.我们通过(i)Hall电导率,(ii)拓扑纠缠熵,(iii)多体纠缠谱的$U(1)$电荷谱流,(iv)任意子的电荷来研究该态的手征和拓扑性质.与有限小尺寸的数值方法相比,无限圆柱体的几何形状使我们能够直接访问和表征金属到分数陈省身绝缘体的过渡。我们发现它是一阶的迹象,没有其他竞争阶段的证据。由于我们的方法不依赖于任何带或子空间投影,我们能够证明在存在超过带隙的相互作用时分数态的稳定性,正如文献中所建议的那样。作为一个副产品,我们讨论的签名陈绝缘体在这种技术。

英文摘要:

Using the infinite density matrix renormalization group method on an infinite cylinder geometry, we characterize the $1/3$ fractional Chern insulator state in the Haldane honeycomb lattice model at $ν=1/3$ filling of the lowest band and check its stability. We investigate the chiral and topological properties of this state through (i) its Hall conductivity, (ii) the topological entanglement entropy, (iii) the $U(1)$ charge spectral flow of the many body entanglement spectrum, and (iv) the charge of the anyons. In contrast to numerical methods restricted to small finite sizes, the infinite cylinder geometry allows us to access and characterize directly the metal to fractional Chern insulator transition. We find indications it is first order and no evidence of other competing phases. Since our approach does not rely on any band or subspace projection, we are able to prove the stability of the fractional state in the presence of interactions exceeding the band gap, as has been suggested in the literature. As a by-product we discuss the signatures of Chern insulators within this technique.

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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