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arXiv 1505.03050cond-mat.str-elcond-mat.mes-hall
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$ν=13/5$和$12/5$的分数量子霍尔态及其非阿贝尔性质

The Fractional Quantum Hall States at $ν=13/5$ and $12/5$ and their Non-Abelian Nature

W. Zhu, S. S. Gong, F. D. M. Haldane, D. N. Sheng

摘要:

我们研究了填充因子为$ν=13/5$的分数量子霍尔态和填充因子为$12/5$的粒子-空穴共轭态在库仑相互作用下的性质,并讨论了可能的竞争态.基于球形几何中的大规模密度矩阵重整化群(DMRG)计算,我们提出了证据,证明$ν=13/5$和$12/5$的库仑基态(GS)物理被$k=3$ parafermion Read-Rezayi RR态($\text{RR}_3$)捕获。我们首先建立的状态在$ν=13/5$是一个不可压缩的的BROSH状态,与GS保护的有限的激发间隙,根据RR状态的移位。然后,通过对不同位移的$ν=12/5$的GS能量进行有限尺度标度分析,发现在热力学极限下,$\text{RR}_3$态具有不同竞争态中最低的能量.基于纠缠谱和拓扑纠缠熵,我们发现了$13/5$和$12/5$态的$\text{RR}_3$拓扑序指纹,这两个结果都有力地支持了它们与$\text{RR}_3$态的一致性.此外,通过考虑无位移的无限圆柱几何,我们暴露了两个拓扑不同的GS扇区,一个身份扇区和第二个匹配的非阿贝尔扇区的斐波那契任意准粒子,这作为额外的证据的$\text{RR}_3$状态在$13/5$和$12/5$。

英文摘要:

We investigate the nature of the fractional quantum Hall (FQH) state at filling factor $ν=13/5$, and its particle-hole conjugate state at $12/5$, with the Coulomb interaction, and address the issue of possible competing states. Based on a large-scale density-matrix renormalization group (DMRG) calculation in spherical geometry, we present evidence that the physics of the Coulomb ground state (GS) at $ν=13/5$ and $12/5$ is captured by the $k=3$ parafermion Read-Rezayi RR state, $\text{RR}_3$. We first establish that the state at $ν=13/5$ is an incompressible FQH state, with a GS protected by a finite excitation gap, with the shift in accordance with the RR state. Then, by performing a finite-size scaling analysis of the GS energies for $ν=12/5$ with different shifts, we find that the $\text{RR}_3$ state has the lowest energy among different competing states in the thermodynamic limit. We find the fingerprint of $\text{RR}_3$ topological order in the FQH $13/5$ and $12/5$ states, based on their entanglement spectrum and topological entanglement entropy, both of which strongly support their identification with the $\text{RR}_3$ state. Furthermore, by considering the shift-free infinite-cylinder geometry, we expose two topologically-distinct GS sectors, one identity sector and a second one matching the non-Abelian sector of the Fibonacci anyonic quasiparticle, which serves as additional evidence for the $\text{RR}_3$ state at $13/5$ and $12/5$.

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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