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arXiv 0912.4432cond-mat.supr-concond-mat.mes-hall
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量子化磁场中双层石墨烯系统中电子空穴对的超导电性

Superconductivity of electron-hole pairs in a bilayer graphene system in a quantizing magnetic field

D. V. Fil, L. Yu. Kravchenko

摘要:

研究了基于石墨烯的双层量子霍尔系统中具有自发层间相位相干性的态。这种状态可以被认为是超流电子-空穴对的气体,其中电子-空穴对的组分属于不同的层。这种对的超流通量相当于层中的两个超电流。结果表明,如果各层的朗道能级填充因子产生一定的不平衡,则石墨烯系统中会出现层间相位相干的状态。我们得到的过渡到超流态的温度,最大的层间距离在相位相干是可能的,和临界值的超流。讨论了用石墨烯系统代替GaAs异质结构实现双层电子空穴超导的优点。

英文摘要:

The state with a spontaneous interlayer phase coherence in a graphene based bilayer quantum Hall system is studied. This state can be considered as a gas of superfluid electron-hole pairs with the components of the pair belonging to different layers. Superfluid flux of such pairs is equivalent to two electrical supercurrents in the layers. It is shown that the state with the interlayer phase coherence emerges in the graphene system if a certain imbalance of the Landau level filling factors of the layers is created. We obtain the temperature of transition into the superfluid state, the maximum interlayer distance at which the phase coherence is possible, and the critical values of the supercurrent. The advantages of use of graphene systems instead of GaAs heterostructures for the realization of the bilayer electron-hole superconductivity is discussed.

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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