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arXiv 1106.0089cond-mat.mes-hallcond-mat.str-el
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5/2分数量子Hall态在锐相界附近的反常鲁棒性

Anomalous robustness of the 5/2 fractional quantum Hall state near a sharp phase boundary

Yang Liu, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin

摘要:

我们报告的磁输运测量宽GaAs量子阱与可调密度探测分数量子霍尔效应的稳定性,填充因子$ν= $ 5/2附近的朗道能级(LLS)属于不同的(对称和反对称)电子子带之间的交叉。当费米能($E_F$)位于对称子带的激发态LL时,5/2量子霍尔态令人惊讶地稳定,并且在该交叉附近变得更强,然后一旦$E_F$移动到反对称子带的基态LL,5/2量子霍尔态突然消失并变成金属态。这种消失的剧烈程度表明发生了一级相变。

英文摘要:

We report magneto-transport measurements in wide GaAs quantum wells with tunable density to probe the stability of the fractional quantum Hall effect at filling factor $ν= $ 5/2 in the vicinity of the crossing between Landau levels (LLs) belonging to the different (symmetric and antisymmetric) electric subbands. When the Fermi energy ($E_F$) lies in the excited-state LL of the symmetric subband, the 5/2 quantum Hall state is surprisingly stable and gets even stronger near this crossing, and then suddenly disappears and turns into a metallic state once $E_F$ moves to the ground-state LL of the antisymmetric subband. The sharpness of this disappearance suggests a first-order transition.

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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