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arXiv 0909.2288cond-mat.mes-hallcond-mat.str-el
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层密度不平衡可调的双栅石墨烯双层膜中的量子霍尔效应

Quantum Hall effect in dual-gated graphene bilayers with tunable layer density imbalance

Seyoung Kim, E. Tutuc

摘要:

我们研究了双栅石墨烯双层膜的磁输运性质,其中总密度和层密度不平衡独立控制。由于双层是不平衡的,我们观察到的量子霍尔态(QHS)的出现在填充因子$ν=0$表明在霍尔电导率的平台,与电子和空穴带之间的间隙的开放。通过改变层密度不平衡在固定的总密度,我们观察到的QHS在填充因子$ν=8$和$ν=12$层密度平衡时,在方差与理论预期的电子-电子相互作用和无序的情况下观察到的抑制。

英文摘要:

We study the magnetotransport properties of dual-gated graphene bilayers, in which the total density and layer density imbalance are independently controlled. As the bilayer is imbalanced we observe the emergence of a quantum Hall state (QHS) at filling factor $ν=0$ evinced by a plateau in the Hall conductivity, consistent with the opening of a gap between the electron and hole bands. By varying the layer density imbalance at fixed total density, we observe a suppression of the QHS at filling factors $ν=8$ and $ν=12$ when the layer densities are balanced, an observation at variance with theoretical expectations in the absence of electron-electron interaction and disorder.

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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