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arXiv 0910.0217cond-mat.mes-hallcond-mat.str-el
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双层石墨烯中零能朗道能级的对称破缺

Symmetry breaking of the zero energy Landau level in bilayer graphene

Y. Zhao, P. Cadden-Zimansky, Z. Jiang, P. Kim

摘要:

利用电子输运测量研究了双层石墨烯在高达35 T的强磁场中电荷中性点附近的量子霍尔效应。在高场区,零能朗道能级的8倍简并被完全解除,表现出新的量子霍尔态对应的填充因子$ν=$ 0,1,2,和3。在倾斜磁场中的激活能隙的测量表明,在新形成的$ν=$ 1,2,3填充因子的朗道能级分裂是独立的自旋,与量子霍尔铁磁体的形成相一致。此外,在$ν$ = 0电荷中性点处进行的测量表明,与单层石墨烯类似,双层在高场下变得绝缘。

英文摘要:

The quantum Hall effect near the charge neutrality point in bilayer graphene is investigated in high magnetic fields of up to 35 T using electronic transport measurements. In the high field regime, the eight-fold degeneracy in the zero energy Landau level is completely lifted, exhibiting new quantum Hall states corresponding filling factors $ν=$0, 1, 2, & 3. Measurements of the activation energy gap in tilted magnetic fields suggest that the Landau level splitting at the newly formed $ν=$1, 2, & 3 filling factors are independent of spin, consistent with the formation of a quantum Hall ferromagnet. In addition, measurements taken at the $ν$ = 0 charge neutral point show that, similar to single layer graphene, the bilayer becomes insulating at high fields.

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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