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arXiv 1105.1385cond-mat.str-elquant-ph
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准二维分数量子Hall态的纠缠度量

Entanglement Measures for Quasi-Two-Dimensional Fractional Quantum Hall States

J. Biddle, Michael R. Peterson, S. Das Sarma

摘要:

我们从理论上研究分数量子霍尔态的纠缠,明确考虑到并强调实验量子霍尔系统的准二维性质。特别地,我们研究了纠缠熵和纠缠谱作为准二维系统的有限层厚度$d$的函数,其中填充分数$ν$在最低和第二朗道能级:$ν$ = 1/3,7/3,1/2和5/2。我们观察到纠缠度依赖于电子占据朗道能级的分数,发现填充分数1/3和7/3被认为是Laughlin态,在最低朗道能级(PDMATHAMN =1/3),填充分数$d$减弱,在第二朗道能级($ν$ =7/3),填充分数$d$增强.对于神秘的偶分母$ν=5/2$态,我们发现在最佳厚度$d$下,基态的纠缠与非阿贝尔摩尔里德普法夫态的纠缠是一致的。我们还发现单层$ν= 1/2$系统并不是分数量子霍尔态,这与实验观察结果是一致的。总的来说,我们基于纠缠考虑的理论结果与基于波函数重叠计算的结果完全一致。

英文摘要:

We theoretically examine entanglement in fractional quantum hall states, explicitly taking into account and emphasizing the quasi-two-dimensional nature of experimental quantum Hall systems. In particular, we study the entanglement entropy and the entanglement spectrum as a function of the finite layer thickness $d$ of the quasi-two-dimensional system for a number of filling fractions $ν$ in the lowest and the second Landau levels: $ν$ = 1/3, 7/3, 1/2, and 5/2. We observe that the entanglement measures are dependent on which Landau level the electrons fractionally occupy, and find that filling factions 1/3 and 7/3, which are considered to be Laughlin states, weaken with $d$ in the lowest Landau level ($ν$=1/3) and strengthen with $d$ in the second Landau level ($ν$=7/3). For the enigmatic even-denominator $ν=5/2$ state, we find that entanglement in the ground state is consistent with that of the non-Abelian Moore-Read Pfaffian state at an optimal thickness $d$. We also find that the single-layer $ν= 1/2$ system is not a fractional quantum Hall state consistent with the experimental observation. In general, our theoretical findings based on entanglement considerations are completely consistent with the results based on wavefunction overlap calculations.

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